Is there a way to add Google Calendar notifications to the indicator message applet?

Question: Is there a way to have Google Calendar notifications through the message indicator applet without using Evolution? Something similar perhaps to "Gmailwatcher"?

Or

Is there a way to integrate Google Calendar with reminders into the calendar in ubuntu without evolution?

Thanks in advance!
Comment: https://github.com/insanum/gcalcli -> "gcalcli is a Python application that allows you to access your Google Calendar(s) from a command line. It's easy to get your agenda, search for events, add new events, delete events, edit events, and even import those annoying ICS/vCal invites from Microsoft Exchange and/or other sources. Additionally, gcalcli can be used as a reminder service and execute any application you want when an event is coming up." -> you can get it output and import to notification area by some scripting
Comment: You can try gcal-notifier-kotlin-gtk: https://github.com/nikitabobko/gcal-notifier-kotlin-gtk it doesn't have evolution as dependency
Answer: You can try typing this in a terminal:
/usr/lib/evolution-webcal/evolution-webcal ICAL_PRIVATE_ADDRESS

(where ICAL_PRIVATE_ADDRESS is the  Private URL of the Google Calendar you want to add)
It only opens a dialog to confirm you want to add this calendar without opening the whole Evolution window, nor the first-run dialog which forces you to add your e-mail account even if you don't intend to use it.
This works with the Gnome 2 calendar applet and I guess it works also for natty's calendar indicator, as it is based on Evolution's calendars. Let me know if it works or not.
Comment: Thank you, I found just out that once everything is setup in evolution, you don't need evolution anymore and the calendar applet still works with google calendar.
Comment: Yes, that's right. :)
Answer: I couldn't find anything pre-made to do what you ask.
It should be easy enough to program something using python-gdata and python-pyosd, I'd say this would be a good project for an amateur computer programmer getting into some of these technologies.
Of course if you get in touch with an independent developer (like me), we'd be happy to exchange code for money too. Never underestimate paying for things to be made.
Answer: If you can't code yourself (and you don't have the cash for Martin ;), you could start a project on launchpad, and once you get some traction from other interested users/developers, work on the actual code (either with your direct collaboration, or with you as project leader).
It is a good way to give back to the community, and to help broaden the available software. You could probably use the code from gmail-watcher or a similar application as a start.
Answer: Nope. You'll have to use Evolution, but you can program something yourself if you're well-versed in Python.
Answer: I found a Google Calendar Indicator from ppa:atareao/test but it need "python-gdata 2.0.14" that is not available in Natty repos. (I downloaded python-gdata 2.0.14 from Oneiric packages.)
It also use NotifyOSD to alert about an event and more features.

It's not bad; try it, wish you like it :)


But confused about SSL VPN and IPsec Site -Site VPN

Question: What might be difference between sslvpn and site-site vpn . Which one among two is secure and it's significance
Comment: Did any answer help you? If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. Alternatively, you can post and accept your own answer.
Answer: Those two have nothing to do with each other.
Site-to-site refers to what you are connecting. In this case, you are connecting two networks. The opposite of site-to-site would be "mobile access" or sometimes called "road warrior": connecting a single device to a network.
It doesn't make sense to talk about security, because this simply talks about what is at the two ends of the VPN.
SSL VPN refers to how you are connecting, i.e. the technology used for implementing the VPN. Or, more precisely, it refers to an entire family of technologies for implementing VPNs. The only thing these have in common is that they somehow, in some way, shape, or form, use SSL somewhere in their protocol. (Actually, one would hope they use TLS and not SSL.) They range from VPNs literally using HTTPS in the browser to tunnel only web traffic to something like OpenVPN, which merely uses the building blocks provided by TLS to build its own protocol on top. The most popular alternative to SSL VPNs (and an international, open standard) would be IPSec, but there are many, many others, both open and proprietary.
It doesn't make sense to talk about security, because this is such a large and diverse family, and security depends on the precise protocol, implementation, configuration, and deployment.
Actually, the way you phrased it in your question, it doesn't really make sense to talk about "secure" at all. Security is always relative to a threat model. If you don't have defined your threat model, then the term "secure" simply doesn't even make sense.
Answer: There's IPsec and there are many VPN protocols based on SSL/TLS. The former is more popular for site-to-site and the latter for mobile access - but you can use them either way, SSL VPN and site-to-site are not at all mutually exclusive.
Since there's no one SSL VPN, you can't say which is more secure. Any decent encryption using AES-128 CGM with SHA128 or better can be considered "secure" (ie. not possible to brute force in several thousand years' time).
Answer: Both SSL & IPsec site-site have they own significants coming to SSL vpn vpn provides confidentiality, authentication, integrity of data traversing through
It uses both symenttric and asymmetric key algorithms (both private and public key infrastructure).; Digital certificate is used to authenticate  SSL VPN connectivity is always intiàted from client-side , it is also referred to as remote access VPN
Comming to site -site vpn is secure tunnel is created between two organisation allowing to share the resource on secure tunnel data is provided with confidence, integrity, authentication
IPsec (internet protocol security) Protocol of ipsec are ESP & AH
Confidential =encrypting packets by encryption algorithms (AES,DES,3DES)
Integrity =sha algorithm
Authentication =preshared key
In IPsec Site -Sites VPN traffic can be initiated bidirectionally
Another supporting protocol which is always associated with IPsec is isakmp(internet security Associated key management protocol)
Isakmp is purely dedicated to transfer the security key from one device to another
Isakmp works on UDP port no :500`
Phase 1 negotiation to exchange pràposal or security associations among peers to create a tunnel(main mode)
Phase 2 negotiation to exchange  propoßl or security associations for protecting actually payloads (quick mode)
1) keys are used to create tunnel
2) tunnel is used to exchange keys
3) keys are used to encrypt data


Can I use the same bitcoin address to receive more than one payment?

Question: I used an old address I once used to receive a payment; can I still receive funds in that address even though the address on my bitcoin wallet has changed? The vendor claimed he made the payment but I can't find it in my wallet. What do I do?
Answer: An old address can be reused, but its usually recommended you don't do so for privacy reasons.
Even if you wallet is displaying a new address, it should still show a balance that includes any recent payments made to older addresses.
To be sure, check the receiving address on a block explorer website, and if the vendor is telling the truth, you should see the recent payment in addition to any past transactions. At that point,  try re-syncing your wallet if the payment isn't displaying properly.
Answer: Can I use the same bitcoin address to receive more than one payment?
short answer: yes.
but think about your privacy. a bitcoinkeypair/-address costs nothing.


Why is Metta Practice so Hard?

Question: I find it very difficult to practice metta. I feel completely agitated when I sit to do metta even for a short period of time.is this normal? First I can't feel any metta being generated and I feel like I'm just repeating empty words to people I'm really not quite fond of to be honest.metta practice is unbearable i feel the urge to  rub my face on sand paper when I do it.I use to think metta was an easy meditation to do as I hear people do it before their main meditation but how can this be,when it so difficult..I don't buy it. Also i found out metta means friendliness and i think this is the problem as I may not be born with this quality.My question is Is metta supposed to be hard? If yes then why is it hard?
Comment: oftentimes I find that doing metta after having done concentration or insight meditation for awhile helps. simply doing metta meditation as a rote/ritual isn't helpful. metta isn't the same type of meditation as insight or concentration but if your mind is darkened or blurred by other things its hard.

not to sound sanctimonious or anything but the mind works in mysterious ways. its easy to get agitated and not know why - but for me, at least, that's usually because there's things in the back of my head nagging and conflicting. so doing concentration first helps. maybe you can try
Comment: Gave an answer below but also must note: 1) You were not born unfriendly, don't carry that burden. It's not made up feel good talk, it just doesn't happen, barring borderline personality disorder.  *Everyone here has negative thoughts that don't define us.*  2) It sounds like you've sat enough to know meditation is not terribly easy in any form. We all have difficulties. 3) If ultimately metta is not for you that's fine, however please don't blame yourself for what you've done or haven't be able to do.  Nothing to feel bad about in what you've written here.
Answer: A lot of people find metta practice hard. I find metta practice hard. Where I practice they have even run day retreats called 'I hate the metta bhvana' to try to address this.
If I can maybe address some of you points with what I've been told and maybe my own experience

I can't feel any metta being generated

It does feel like the task is to pump out as much metta as you can but I was told by a very experienced practiconer that this is an unhelpful way to think about it. Rather than trying frantically to be a metta generating machine he said the task is to be with whatever comes up when you bring people to mind. That might be metta, it might be irritation, it might be a big aching feeling of numbness. If it is then that is what it is and the task is to be open to that. Perhaps being sensitive to metta if it is there but being sensitive to it's absence if it isn't.

I feel like I'm just repeating empty words

The traditional formulations can feel very fake. If they do then maybe don't do them and just try to have an awareness to that person. Someone said of the formulations that they are like a submarine pinging a sonar out and seeing what if anything comes back. Personally I don't often do them but sometimes I will say them to myself after another (breath) meditation and that can give other mediation a more metta-ful quality.

metta means friendliness and i think this is the problem as I may not
  be born with this quality

Not knowing you but knowing human beings I'm going to say you do have this quality but it can be just numbed out of you by day to day living,. I think this is where faith (śraddhā) comes in. Have faith that you do have this quality and it is a universal human quality that everyone can connect with.

metta practice is unbearable

Be kind to yourself. The beginning of the practice is have metta to yourself. Give yourself a break during practice by coming back to the breath or take a break from the practice for a time. If at all possible, don't give up completely.

it so difficult.

It is difficult. You are doing a difficult thing. You and everyone that does this are heroes for even trying it. Own the difficult. It's difficult because it's difficult and celebrate yourself for engaging with it. You are amazing for doing it.
Good luck.
Answer: Last time I went on retreat we did some metta practice everyday and I found it very difficult in the same way you are describing. I didn't feel any genuine friendliness, I just felt irritated. One particular day I was feeling especially averse to it. The teacher gave a talk on metta and it made made me feel nothing but anger. After the session I begun doing some walking meditation and I started to cry. Waves of grief came over me and I sobbed for a good hour. Once the anger and grief had passed I felt the most exquisite peace and pure joy and a friendliness to all beings. What I learnt is that the metta is there but I couldn't connect with it because it was covered over by anger, pain and sadness etc. It was being blocked. I think it's easier for some people but for those of us who have maybe been hurt more or suffer from a lot of difficult afflictive emotions it's much harder but all the more reason to try.  You don't start out trying to send metta to someone who you feel no fondness for at all. Start by sending it to someone you like, a friend or loved one.
Answer: I think there are different reasons why it can be difficult to practice Metta meditation. What could those reasons be?
First of all there is the 5 hindrances. I am sure you already know them so i will not go further into them here.
The second hindrance which is ill-will (hatred, anger, resentment towards oneself/others, hostility towards one self/others/the meditation object etc.) can be a hindrance for metta meditation.
As with most of the spiritual work we do one has to begin with oneself. One has to develop oneself, care about oneself, forgive oneself for the things one has done to others and what others have done to oneself.
If one cannot be there for oneself then how can one expect one to be there for other people? Yet alone send metta towards other beings.
Im not saying you are not there for yourself because i do not know anything about that. I am here coming with suggestions for you to further falsify/validate by yourself.
It could be that you have some unfinished business with yourself or that you have some hostility towards yourself. In metta meditation one begins with wishing metta for oneself. Oneself is first base, the foundation. So if one finds it difficult to sent metta to other people it can be helpful to take a look at the sender, the giver - oneself.
How can you do that then?
There are different methods. The purpose is to wish for example; "may i be happy, peaceful and free from mental and physical suffering". Thats one way to wish metta for oneself.
Another way is to try to look at the deeds you have done in your life and see if any of them is worth respecting. You can look at it as if the deeds where done by another person and then ask yourself; is that deed worth respecting? Is that deed helpful to other beings? If you can answer yes to any of these questions then you can use the metta from that deed to sent to yourself.
Next step in the metta meditation is to sent metta to loved ones for example parents or family in general. Then comes friends, then neutral persons, then persons who are your enemies/people who consider you their enemy/people who just dont like you etc., then comes all beings in this world.
You dont even have to follow that order i just wrote. You can sent metta to the aforementioned people in any order you want. Although most people find it the easiest to begin with sending metta to family or loved ones and then use that generated metta to sent to other people. So when you reach hostile persons and find it difficult to generate any metta for them then you can go back to sending metta to your family or loved ones and when metta is generated then go back to the hostile persons and sent it to them.
Its important that the metta is there or else it will be like you said; just empty words one is sending forth.
An important note:
a) dont be too hard on yourself. It serves no purpose. If there arises emotions or other of the 5 aggregates, use your vipassana to observe them, note them and let them go.
b) in my message when i use terms like "oneself, you, people etc." im only speaking on a conventional level. Im not dealing with ultimate reality here.
Lanka
Comment: I agree that this is mostly a western phenomena. I think it is closely related to the extreme level of greed, money and constant production there exists in the west. A lot of people feel bad even when relaxing at home on their couch. They feel they are not even entitled to that and that they should really be working or in another way doing something "useful". I hope that the increased focus on meditation and spiritual work in the west can somehow balance it out sooner or later. It is not healthy for people to have this "bad consciousness" perspective on things.
Comment: My experience, and those of some (but not all) of the people around me is that some people /do/ find metta meditation easier outwardly first, at least to a few of those they already profess love, before addressing themselvesand from there further outward. The general opinion of teachers seems to be that this is much more common in the Western mind, and is often related to depression: obviously this discrepancy is something that seems to often get raised with teachers because the conventional description is just as you say.
Comment: Hi All, hopefully everyone on this topic able to read this. Was just wondering, can one just skip all and go straight to the neutral party? Wouldn't the coverage be much more wider? It will probably goes like this, may all beings be happy, may all beings be peaceful.......Instead of starting with May I be happy, may I be peaceful...I suppose the "All" includes yourself too. Would it work?
Comment: @sunset_limted. I do not have the sufficient knowledge to answer that absolutely. I can tell you my own understanding which is that one must begin with oneself before one can help other beings. I might not be right about this. You should ask a person who is experienced in Metta meditation.
Comment: When u meant sending the Metta to others including the one u dislike, I assume they will become the benefactor of ur Metta practice? Don't u at least for 1 sec find it irony to send Metta to those u dislike, to those who once hurt u?Do u think they deserve to be beneficial from ur practice? To wat extend?
Comment: I would like to especially develop loving-kindness towards a hostile person. Why? Because Metta meditation is the antidote for "ill-will", which is the 2. of the 5 hindrances. The 5 hindrances are what stops one from developing in meditation and thereby develop the ability to see reality "clearly" and do away with ignorance. Also there exists no "Self" or "I" so there is noone to be hurt in the first place. You can learn more about Metta practice here: http://www.buddhanet.net/metta_in.htm
Answer: I feel your pain, can recognize alot of what you wrote. I am forturnate to have found some guidance early because metta meditation is now very valuable for me
The Four Immeasurable Minds
First i like to say that it will be easier to have metta (love) if we have karuna (compassion), mudita (joy) and upeksha (equanimity and non-discrimination) so if you can improve one of these three that will help you with metta as well since these four all support each other (together they are called "the four immeasurable minds")
Starting with a non-difficult person
Another thing is to not start with difficult people but instead start with yourself or with someone you like. One setup can be like this for example:

Oneself
Someone we like
Someone we dislike
Someone who we are neutral towards
Someone we love
Someone we normally cannot stand thinking about

I usually stay with one person until feeling metta and this may mean that time actually runs out and i only get to 3. (Quitting on 3 or on 4 there is at least a balance, that's how i'm thinking)
Using this setup we are able to use the positive emotions that we get from 2 for 3 and from 5 for 6
Calming the mind first
My experience (and also from what i've read) it can be useful to first spend some time calming the mind and then switching to metta meditation. For example we may want to count ten breaths, starting over if we loose track

Book recommendations:

Teachings on Love by Thich Nhat Hanh
Compassion by Christina Feldman
Comment: Can we just skip all and go straight to the neutral party? I think the coverage will be much more wider. It will probably goes like this, may all beings be happy, may all beings be peaceful.......
Comment: Yes, like in the [Metta Sutta](http://www.accesstoinsight.org/tipitaka/kn/snp/snp.1.08.amar.html). I've also experimented with including myself when sending loving kindness, so instead of saying "may she be well" i could say "may we be well" (meaning us two), this helps me alot for allowing my own needs to be included in interactions with this person
Answer: I actually benefited from Metta a lot. I wasn't always sitting down to practice it. The way I did it was, whenever I got irritated about someone, I would flush away the irritation by forcing thoughts of Metta about the person.
Lets say person 'X' angered you.
The mind will always try to keep justifying your anger, giving various reasons.
ex: "but X is wrong!", "X is jealous of me!", "X doesn't deserve kindness!", "X is arrogant!", "X is ugly!", "X is ugly and arrogant!", "X is stupid!", "X is ill-mannered!", "X embarrassed me!", "X insulted me!", "X is stingy!", "X is worthless!", "X deserves punishment!", "X is persistent", "I'm supposed to get angry!", "Who wouldn't get angry?", "People will think I'm a coward" etc.
Whatever the reason the mind comes up with, don't agree to it! The attitude should always be "So what? Whatever you(the mind) tell me, anger is not what I want! What I want is Metta. So may X be happy, may X be well, may X be devoid of anger, suffering, grief, may X's riches grow etc.". It's actually a mixture of Metta, Karuna and Muditha.
After practicing this for a while, the mind comes up with less reasons to justify anger and X starts to disappear. Now when you get irritated, you are not focussing on a person. You are focussing on anger itself. Because the qualities of the person become unimportant at this stage. And the moment you notice anger, you push it away with Metta. It becomes easier and the mind starts getting less and less angry as you practice it. As a result you will feel the comfort of not getting irritated. It'll boost your confidence and fill you up with joy. You will feel like a soldier wearing a strong armer which cannot be pierced by any weapon.
At this stage, you can also convert this into Vipassana and do Dhammanupassana. Just observe any irritation including the subtle ones without reacting or trying to suppress them like you did earlier. Observe them arising and passing away without your consent.
Comment: When u r mad at A, then u go may A be well and happy n etc. Wat if the heart dun mean it but u just said it for the sake of Metta?Isn't it exactly wat the question said so, it's really hard.
Comment: Yes, it can be hard at the start. But that doesn't matter. Two thoughts can not occupy the mind at once. So just keep suppressing the stream of hatred with thoughts of Metta. It's similar to a married man trying to keep out thoughts of lust when he interacts with a woman prettier than his wife. Just keep suppressing the thoughts. It becomes weaker with time.
Comment: I thought we are taught not to suppress it?Aren't we suppose to accept and confront it?
Comment: That's Vipassana. This is a Samatha meditation.
Comment: Even in Vipassana you don't confront it. You simply note it.
Answer: Each of us has a image of oneself and others. When there is a disparity on how you see the attributes you attach with the person and the perceived relative differences you react either positively or negatively.
What you have to do is when doing Metta note mental reaction and the sensations it brings. Do not react to the sensations. As you do this the reaction becomes lighter and lighter and actual Metta will sink in.
Ideally you should calm the fabrication before doing Metta to be effective. No harm doing this to start with also but end with Metta and the latter will be more effective.
Answer: My guess would be that you are making it harder than it might otherwise be. I don't mean to imply you are "doing it wrong". Persisting and seeking feedback as you are doing here is already such an important milestone.
May I ask how you are guiding yourself?  Are you are working with a teacher (so many times we don't have that luxury)?  Are you learning from dharma talks, or if reading, what material are you studying?
It'a such a personal journey. It's hard to say why it seems so difficult to you, yet seems life changingly blissful and beautiful to me (with some rough spots of course!). How can this night and day difference between us in experience be explained?
 Especially if I confide to you that by nature I'm not a spiritual person, fairly cynical, and not a people person to the point I would prefer not to receive an invitation to a great party?  The point is, although we can't know for sure why you are struggling, it seems intuitive that if I could find a path, you have it in yourself to find one as well.
Some points that may or may not be relevant to you:

I believe having a motivating life situation, combined with a teacher (or learning material) you connect well with is critical.  I had no teacher available, and started by reading the Salzburg book.  It instantly resonated, made perfect sense to me, and was highly motivating. Some authors are equally well reviewed, yet I finish their book and think, meh.  How confident are you that you've found your best ways to learn and train that fit your brain in particular?
.
Have you modified the recitations to be something other than the verbatim, defaults that everyone tends to talks about when explaining things? I spent a fair amount of time trying different variations and refining them, trying to make each iteration closer to something that I could feel strongly inside myself, and that reflected the direction I knew I most needed to move toward.
.
The idea of having any connection with an enemy, hated person, or worse, someone innately evil, kind of scared me as far as worrying I'd never even be able to come close to achieving it.  Consequently I dwelled on the easy levels for a long time, for months, just trying to improve as much as I could on the basics.  Is it possible this (dumb luck) strategy somehow allowed a lot of positive reinforcement before getting to the hard stuff?  I'm not sure.  How long did you study and practice before you tried the some of the difficult stuff?

I know it's not easy to give more time to something that doesn't seem to be working.  And maybe you shouldn't.  Who's to say taking some time off and trying again later won't allow a refreshed perspective and more productive practice?
Whatever the case, I sincerely hope you'll be able to find an approach that's a good match, because I'm somehow sure you're capable of it.
Answer: Metta is something for monks so they have good social relationships with the few people they meet in their uncomplicated social relationships.
For lay people living in the complicated world, in my opinion, it is best to primarily develop equanimity.
Once equanimity is well developed, it can be spiced up with some convenient metta.
Comment: I don't intend to criticize or offend you.  I would simply like to ask if there is any basis in the teachings for. 1). Metta is for monks. 2). It's best to focus on equanimity rather than metta.
Comment: Do you have any basis for this other than off the cuff opinion?  I'm worried this is tragically incorrect, and could prevent someone from preserving to a positive outcome. How much time did you invest in metta practice before coming to your opinion?
Comment: Sorry, I will not stop commenting, and you are incorrect, polite debate is acceptable here.
Comment: I did not say debate is the purpose here, rather that it is allowed when polite.  if you disagree I would suggest a couple of options. First, you may provide a citation or link supporting your assertions of the rules and etiquette.  Alternatively,  you may start a meta.stackexchange.com topic where a more complete discussion about the spirit and letter of rules may take place. Until then, you simply have no right to instruct anyone here to stop commenting.

Why is Metta Practice so Hard?


Term to cover polyps, benign and malignant growths

Question: What would be the correct term to use to cover polyps, benign and malignant growths? Covering both Hyperplasia and Dysplasia I guess...
Comment: The name of an investigation for colonic polyps?
Comment: No, I'm just seeking an overarching term to cover abnormal growth, both neoplastic and non-neoplastic (benign, pre-cancerous and malignant)
Answer: Dysplasia describes abnormal cell morphology or differentiation without the proliferation rate being affected. Dysplasias can result in an increased number of one type of cell as a result of another type of cell being reduced in number (e.g. because the first type is failing to differentiate into the second, but not because any cell is proliferating more than usual).
Hyperplasia describes increased cell proliferation which results from an adequate response to a growth signal. This includes for example red blood cell hyperplasia as a result of hypoxic environment or erythropoietin treatment.
Neoplasia covers all forms of abnormal cell proliferation. Unlike a hyperplasia, neoplastic cells proliferate regardless of growth signal presence or absence. If the neoplastic cells are adhesive, they may stay together as a lump and form a tumour. If they invade other tissues, they are malignant and also called cancer.
Polyps are abnormal "growths", i.e. appendages grown from a tissue that do not normally occur. Usually, the tissue that has grown itself is not abnormal; rather, there are abnormal amounts of a signal instructing the tissue to grow. In this case, the polyp is usually hyperplastic (increased cell number), and sometimes also hypertrophic (increased cell size). Polyps can progress to neoplasms, usually first benign, and at late stages malignant.
The only term describing both hyper- and neoplasias is "hyperproliferation", which is not a medical term. This still doesn't include dysplasia, and I can't think of a term that would. Maybe "non-nascent cell behaviours"...
https://en.wikipedia.org/wiki/Dysplasia has a quick overview of -plasias and -trophies.
Answer: The all-inclusive term for abnormal growths is neoplasm or, in Latin, neoplsia:

Neoplasia is new, uncontrolled growth of cells that is not under
  physiologic control.

Abnormal growths can be:

Benign: growing but not spreading or destroying nearby tissues
Malignant: invading nearby tissues or spreading to distant organs

The term tumor refers to any abnormal localized mass of tissue, either benign or malignant.
The term polyp covers all tumors that grow from the mucous membranes and project into the lumen of an organ.
Comment: Mmm, what about blood cancer?
Comment: Blood cancer is an example of "abnormal growth" as they are all other examples mentioned so far. The Latin term is neoplasia.


Expected min distance between N Uniform RVs

Question: Inspired by this recent question, what is the expected value of the minimum of the pairwise distances between $N$ uniform and independent RVs (uniform in $[0,1]$)? i.e. Let $X_1,...,X_N$ these RVs, the question is to find $E[\min_{i\neq j}|X_i-X_j|], \ \ \ 1\leq i,j\leq N$. I'm numerically convinced that the answer is $\frac{1}{N^2-1}$.
Comment: There is a proof provided here https://math.stackexchange.com/a/2001026/653851
Comment: @Win Thank you for finding that: although that answer does not explicitly bring it out, it derives the entire distribution, not just the expectation.  And although it does so by integration, it uses several steps along the way that provide insight into the problem and therefore are worth studying.
Answer: You are correct.
One route to the solution, using only well-known relationships among these variables, is the following:

Generate iid Gamma$(1)$ variates $V_i,$ $i=0,1,2,\ldots, N.$  (These are exponentially distributed variables.)
Set $Y_1=V_0$ and $Y_i=Y_{i-1}+V_{i-1}$ for $i=1,\ldots, N+1.$  These are the partial cumulative sums of the $V_i.$
The order statistics of the $X_i,$ written $0 \le X_{(1)} \le X_{(2)}\le \cdots \le X_{(N)},$ have the same distribution as the $Y_i/Y_{N+1}$ for $i$ between $1$ and $N.$
The minimum of the $|X_i-X_j|, i\ne j,$ must be the minimum of the difference of two consecutive order statistics $X_{(k+1)}-X_{(k)} = V_{k^*}/Y_{N+1}$ for $k^*$ between $1$ and $N-1.$
$V_{k^*}$ is the minimum of the $N-1$ iid exponential variables $V_1,V_2,\ldots,V_{N-1}.$  Thus, when multiplied by $N-1,$ it has a Gamma$(1)$ distribution.
Conditional on the minimum, the remaining $N-2$ Gamma variates in $(5)$ are each distributed as $V_{k^*}$ plus iid Gamma$(1)$ variates.  Letting the sum of the latter be $W,$ of which there are $N-2$ terms, that sum can be expressed as $V_{k^*}$ itself plus $(N-2)V_{k^*}$ plus an independent Gamma$(N-2)$ variable $W.$
The denominator in $(3),$ $Y_{N+1}$ itself, is obtained by adding the independent Gamma$(1)$ variables $V_0$ and $V_N$ to that.  Their sum with $W$ creates a Gamma$(N-2+1+1)$ = Gamma$(N)$ variable $Z.$
Consequently the minimum distance among the $X_i$ has the distribution of $V_{k^*}/((N-1)V_{k^*}+Z)$ where $(N-1)\,V_{k^*}\sim\Gamma(1)$ and independently $Z\sim \Gamma(N).$
Any ratio of $U$ to $U+Z,$ where independently $U$ has a Gamma$(a)$ distribution and $Z$ has a Gamma$(b)$ distribution, has a Beta$(a,b)$ distribution.

Thus, with $a=1$ and $b=N$ and accounting for the scale factor of $N-1$ in $(8),$

$N-1$ times the minimum distance among the $X_i$ has a Beta$(1,N)$ distribution.  Because the expectation of that Beta distribution is $1/(N+1),$ the expectation of the minimum distance is $1/(N-1)\times 1/(N+1) = 1/(N^2-1),$ as claimed.

Deviations from this formula will be clearest for small $N,$ so here is a histogram of a sample of size 100,000 from the minimum $X$ distance for $N=3$ with a graph of the (scaled) Beta density superimposed.  The agreement is excellent.

<code>N <- 3
n <- 1e5
set.seed(17)
u <- matrix(runif(N*n), nrow=N)          # IID uniform variates, in `n` columns
u <- apply(u, 2, sort)                   # Their order statistics
u <- apply(u, 2, diff)                   # The gaps between them
x <- apply(matrix(u, nrow=N-1), 2, min)  # The smallest gap
hist(x, breaks=50, freq=FALSE)
curve(dbeta(x*(N-1), 1, N)*(N-1), add=TRUE, col="Red", lwd=2, n=1001)
</code>
Comment: I can't help thinking there's a simpler derivation that doesn't take this roundabout trip through uniform, exponential, and gamma variables while relying on facts about order statistics, distributions of minima, and conditional distributions of iid exponential variables -- but perhaps there is something instructive about the relationships exhibited here.
Comment: I'm afraid my account describes pretty closely the sequence of steps I took.  The first four are a familiar way to understand gaps among uniform order statistics and the rest consists of attempts to understand $(4)$ without actually integrating.
Comment: I wonder how you came up with this method :)


How do I transfer completed photos from LR to an external hard drive?

Question: I am a newbie to Lightroom, so keep this in mind.  I understand how to transfer my edited photos and collections from Lightroom to my external hard drive, BUT when I do so, the photos revert back to the original state, and all the editing I did disappears (I only have the new file on my hard drive). Am I missing a step to enable my photos to 'carry over' the info to my hard drive?(maybe I need to convert my files somehow before transferring the files?  I have been dragging and dropping onto my external hard drive).
Comment: Did  you use the export function? If you did, were you using the 'original' setting in file settings?
Answer: Lightroom uses non-destructive editing. That is, all the edits are stored in a separate files that is then read by the program. This means that to get a standalone file has all of the edits included you need to use the "export" function. This can be accessed by selecting the image/s that you wish to export and then:

right clicking on them and clicking the 'export' option OR
selecting the 'esport' option in the 'file' menu at the top of the window OR
clicking the large 'export' button that can be found in the bottom right of the window
Answer: You have a few options:

Use Lightroom's export option to export the files to your external drive. This allows you to export compressed files like JPG, loss-less files like TIFF or if you want to keep the raw files you could export DNG files. DNG files are different from camera proprietary RAW as they store the raw data and the edits applied.
If it's really important to you, you can convert all imported files to DNG files during the import process. Ensuring all the files in the original catalog keep RAW data and edits in one file. This would allow you to do a simple copy and paste later using your OS and would also allow you to keep your edits when transferring to other photo editing software with RAW capabilities.
Answer: All the editing and adjustments you make to an image in Lightroom aren't stored in the file. They're stored in Lightroom's database, aka the catalog file.  This is the .lrdata file that Lightroom creates whenever you create a new catalog.  The catalog also tracks where all your files are on the hard drive. Lightroom only applies all the edits and adjustments you've made to your original image file when you perform an export, and saves it all as a new file, leaving your original alone.
This may seem weird and roundabout, but it's how Lightroom can do "non-destructive" editing, so you can always go back to the original; virtual copies--so you can try out any number of adjustments as if you were working on separate files, but still not take up additional space on the hard drive with new image files; and keep the editing History of the image from session to session (something Photoshop can't do, because it doesn't use a database).
Dragging and dropping to copy a file, whether you're doing it inside Lightroom, or through the OS is merely moving your original image file somewhere else on the hard drive. And if you look at the file directly through the OS, you're only going to see your original file.  You have to export the image to get Lightroom to apply the instructions it has stored in its database to your image file and create a new image file with all your changes in it.  You can export by right-clicking on an image and selecting Export from the context menu, the File -> Export menu command, or the Export button.
Once at the Export window, you can specify all kinds of things for the new file, including the resolution, watermarking, and file format.  As long as you don't choose Original, all your processing commands should be applied to the final image.
If you're worried about database corruption suddenly isolating your images from your edits, there are two other ways the processing instructions can be stored: either inside DNG files, if you've converted your original images to DNG on import, or with XMP sidecar files.  This tends to be a personal preference.  Some folks have faith in Lightroom's database cleanup utilities, or their own ability to find open source tools for SQLite databases to repair any issues (the .lrdata file is just a SQLite database).  Others prefer having a different-format backup that they know they can completely rebuild the database from if they have to.  It's up to you how or if you want to spend the additional hard drive space/file management.


Do I need a flash drive for Xbox 360 specifically or can I use any flash drive?

Question: I am going to buy a flash drive for my Xbox. Do I need a flash drive specifically for Xbox 360 or can I use any flash drive?
Answer: According to the XBbox 360 site, you can purchase either specially formatted SanDisk USB drives of 8 or 16 GB or unformatted USB drives from any company in sizes from 1 to 32 GB. You can use a larger drive but the Xbox will not utilize more than 32 GB.
If the drive does not have at least 1 GB of space, it will not be recognized.
If you don't buy a formatted drive, you'll have to format it but you can do so by plugging it in and pressing the Guide button on your controller then going to Settings and System Settings.
Select the "Storage" or "Memory" option and then "USB Storage Device".
You can then choose to either "Configure Now", which will erase and configure it with default settings or "Customize", which allows you to limit the Xbox format to only part of the drive.
Answer: You may use any flash drive that is 4 Gb < x < 32 gb. They have more specifications on their site regarding speed, etc.


Day or night (The best time to apply pesticides)

Question: Having tried a lot of homemade pest control remedies, I'm thinking of using pesticides for a change but im not so sure on how to use it correctly. The label says to use 25ml per liter of water but nothing else and i was wondering if there's such a thing as "the best/worst time to apply it" so if anyone has tried this stuff, let me know on how to go about it.
Comment: I think you should write some more about the specific pesticide, e.g. is it against which pest.
Comment: Who uses pesticides, I call the ecological imbalancers?
Comment: @black thumb_ well i certainly dont plan on using it through out the year. I only plan on using a little now to kill a very small number of aphids untill all the beneficial incests have woken up. If i wait and do nothing, those things will have multiplied by the hundreds and no predator would be able to fight them off then.
Comment: you're hurting the predators :'(
Answer: Insecticides are best applied during the day (when you can see what you're doing), but preferably when the plant is not in direct sunlight, and preferably at dusk, when the bees and other pollinating insects have stopped working, although that is more important when plants are actually flowering - if they're not, you're less likely  to spray any beneficial insects because they won't be there. Always spray beneath the leaves as well as the tops, and spray till run off... and avoid spraying flowers if possible. You don't say what type of insecticide you're using, but note that systemic insecticides work for up to two weeks, contact insecticides only kill what's on the plant when you spray, they confer no protection after that. If the container doesn't say what type it is, the recommendations for how often to apply will demonstrate which one it is - systemics usually say apply every 10-14 days (if necessary) or similar.
Comment: Oh, yes, there's a bit I missed out, I'll adjust my answer.... half asleep today!
Comment: Have you identified the insects you're trying to kill so that you know that you're actually killing pests? I knew someone who treated roses and annual geraniums with a neonicitinoid (systemic) insecticide to kill Japanese beetles. She identified the insect properly, but by the time the beetles were eating the rose flowers they had already mated and it was really too late to do anything about next year's beetles. To make matters worse, the beetles never touch annual geraniums. Because she was using a systemic neonic, she was actually killing bees, flies, and butterflies with her poison.
Comment: No - they're not formulated to be used on plants, Most countries have  a choice of insecticides (contact,systemic, maybe different ingredients) and they are specifically formulated for use on plants.
Comment: But why not at night though? I mean during the day, if i spray it on, it's gonna get the beneficial incests too but at night the beneficial incests fly away returning to their homes while the unwanted critters stay behind sticking themselves onto the plant. So a night time application would kill them on contact without harming any of the beneficial incests or atleast that's what makes sense to me but of course i could be very wrong.
Comment: @bamboo_ that's good information. Thanks and regarding the kind of insecticide, well i checked and the label reads "general purpose home garden insecticide" and it also says to apply after 10-15 days if necessary so i guess it's a systemic one but what about contact insecticides. Are we talking like those common household fly/roach sprays? You can use that on plants?
Comment: @jurp_ oh jee. She must have been gutted. I hope her roses are ok though. There's a lesson here i guess. I have a rose problem too. Im dealing with aphids. Its nothing serious at the moment but it will become one if i don't act now cause these things hatch like crazy and I wanna get them now and not wait for an infestation.
Answer: It depends on the insecticide.
First rule: read the label, but in your case you have no restrictions. Some insecticides should not be used when too hot, but some other not when it is too cold.
Second rule: if it is a contact insecticide (not for night pest), better to do in the early morning, when insects will sleep or not move much. I think night is also good.
Then you should check what pest you are fighting. From your comment on @Bamboo answer, it seems that you are thinking that good insect are active only during the day. This is not true (there are various flowers [especially white or very pale] which are pollinated only during night, not frequent on gardens, because you do not want flowers that you never see). But also some pests works only during day. Caterpillars often eat during night and hide during day. On the other hand we like many butterflies (but not moth, which are nocturnal).
Many insecticides do no arm bees (but some yes), so I would also check not to spray them when you see bees.
But weather is also important, you do not want to spray too early, if there will be dew in the morning. On the other hand, if you have less wind during night, night will be ideal (compared windy mornings or evenings, but depends on your locale climate).
Personally, I think day is better, because you can check better what to do, and so being more effective (all surfaces, and more regularly). On the other hand, you may use them also on night.
If it is very hot, night is better, on contact insecticides: you need to spray all surface, so very tiny drops, but they could evaporate before touching leaves. On agriculture, there are many studies about size of drops, speed of spraying and effectiveness (all depending on culture, pesticide, and climate), but this is mostly for professionals.
Comment: _ very helpful. Thanks for the info. I read the label and it reads "general purpose home garden insecticide". However my problem is just with aphids. They're only a few. Enough to easily remove by hand but since buds are forming at this stage, i won't get all the aphids without knocking off a lot of the new growth. You mentioned night time pollinators and i got curious so i grabed my torch to examine my plants and saw quite a few house flys but much bigger in size resting on the leaves here and there. Where do they fall, pests or pollinators?
Comment: Also, i took notice of the current weather conditions as you pointed out and saw best to spray in the evening. Hope i wouldn't need to spray a second time.
Comment: @HamidSabir: Maybe you should ask a new question with the photo of aphids. Sometime just water or easy remedies are useful (but it depends on the type)


"You first" "You second" "You third"

Question: Suppose I'm telling a bunch of people to do something. I'm about to tell a person :"You first", can I say to the others :"You second", "you third" ... ? And is there another way to say that ?
Answer: The suggestion in the question is fine. You could also point at the people and say, "You first, then you, then you, ..."
Any difference is practical, rather than linguistic. It's probably easier for most people to remember "I go after Jane" and then just wait for Jane to go, than it is to remember "I'm number 17" and accurately count the number of people who've gone. On the other hand, if anyone before me forgets who they go after and I only know that I go after Jane, the whole thing is going to fall apart.
If you want to use other pronouns, then strictly speaking, the answer depends on whether the people you're pointing at are the subjects or objects of the verb. So, if you're describing the line-up at a talent show, "She sings first, he second, he third, then she, ..."; if you're instructing your assassin, "Kill him first, him second, her third, ..." However, most people would probably use "him/her", even when it's not grammatically proper so, in the first case, "She sings first, him second, him third, then her" sounds a bit more natural, to my ear at least. If the verb is left out of all the list items, you can probably use him/her all the time.  For example, "In what order are the contestants singing?" "Her first, him second, ..."
Comment: +1 This is the only answer (so far) which actually confirms that the OP's original wording is itself adequate.  Everyone else only suggests alternatives.
Comment: +1 for being specific about assassins. I've had lots of trouble instructing mine in the past.
Comment: Agreed. "You second" etc are fine.
Comment: What if I want to use other pronouns. Should I use objective case or subjective case? Which sounds more natural? "He second"/"him second".
Answer: You can add the verb go:

You go first, you go second, and you go third.

Or, some other verb might be more appropriate, depending on the situation. For example, to three kids sharing a dish of ice cream:

You take a spoonful first, you go second, and you third.
Answer: If you don't want to get bogged down in the numbers, you can use something like this:

You go first, then you're next, then you, then you, then...

You could repeat "then you go next" for each person. But it's perfectly fine to drop some of the words once you've established the pattern: "then you" or "you're next".
Answer: I don't have enough reputation to make a comment, sorry, but in response to the question you asked David Richerby

What if I want to use other pronouns. Should I use objective case or
  subjective case? Which sounds more natural? "He second"/"him second"

In this case you should use "him second," as this sounds more natural. However if you go with J.R.'s suggestion of repeating the verb, then it would be correct to use "he", as in "he goes second".
Answer: "You first", "You second", "You third" are perfectly correct and understandable.
When air traffic controllers talk to pilots, the standard terminology that they will use when sequencing aircraft for takeoff and landing is: "You're number one", "You're number two", etc.

"You first" "You second" "You third"


Permission change after setup:upgrade

Question: For some reason every time I compile or setup:upgrade the file permissions on my server change and my site's layout is affected. Does anyone know what can be causing this?
Comment: Are you clearing your cache?
Answer: See my answer to this question.
The problem here is that newly generated files are owned by the user and group who issues the command $USER:$USER, where they should belong to $USER:www-data or $USER:apache. Because apache2 does not have access to the group $USER, the website cannot be properly served.
In order to retain proper permissions, magento commands should be executed as the apache user.
For example:
Ubuntu
$ sudo -u www-data php bin/magento setup:upgrade
CentOS
$ sudo -u apache php bin/magento setup:upgrade
This way, new files are owned by www-data:www-data (in the case of ubuntu).
So long as you have properly followed Magento's documentation with regards to permissions and added the cli user to the apache2 group, then you will have proper access to the files.
If you did not follow this documentation then you can execute the following command to do so:
Ubuntu
$ sudo usermod -a -G www-data $USER
CentOS
$ sudo usermod -a -G apache $USER
Note:
In order that commands can be executed without declaring the apache2 user, Daniel's answer explains that we can modify how the Magento framework sets permissions for new files.
Answer: I am using linux and apache and only these steps worked for me.
sudo chown -R <username>:www-data /var/www/html/<project name>

systemctl restart apache2 (restarting apache)

sudo adduser <username> www-data (add system user to apache server group)

cd /var/www/html/<project name>

chmod -R g+s pub/static pub/media generated (folders which inherit the parent permissions)

Permission change after setup:upgrade


How do multi-core CPUs work?

Question: I know, vague question title, but my main question is, does 1 core have to execute only one program at a time? Does the "multitasking" at the CPU level work by switching between tasks, and if so, why? Why can't CPUs work on multiple tasks at the same time? They have billions of transistors, why can't some transistors work on one problem while the others work on another? is it a hardware restriction, or just an OS restriction?
Comment: Worth noting: Intel CPUs **do** have the notion of "tasks", but OSes ignore them and implement task switching manually.
Answer: A transistor can't "work on a problem". It's a basic building block of CPU's, useless on its own, but required to build logic gates (which can then compute simple operations like addition, etc...). There's a lot of hardware in a single core, more than just one transistor.
There's also much more in a CPU than just "doing stuff". There's a virtual memory manager, a hardware cache manager, various interfaces to connect the CPU to the motherboard and to the system memory, etc... Multicore CPU's often share a lot of hardware inside the actual CPU.
A "program" is a software concept - the CPU doesn't know what it is. All the CPU does is execute operations sent by the operating system. In this sense, a single-core CPU can only perform one logic operation at a time. But you still are able to do multiple stuff at the same time even on a single-core processor because the operating system switches the program which is currently running at a very fast rate. Multicore CPU's allow you to run more than one task at the same time, which can be exploited by the operating system by allowing you to run more programs at the same time comfortably, or having one program take advantage of multiple cores to run faster.
Technically, a "program" is a process divided into one or more threads, each of which are independent in their execution, they all have their own stack, CPU context (registers, etc..) and other stuff, though they can still communicate between each other within the process, obviously.
Comment: Sorry for responding so late, but does that mean that an OS could theoretically allow two or more programs to use a fraction of the transistors available on a CPU?
Comment: @MarcusJ: They do. That's what multiple cores are for.
Answer: The classical cycle that CPU's follow is:

Fetch Instruction -> Decode It -> Execute It

Reason being is that most problems that people have historically wanted to solve with computers have involved following a number of steps, one at a time and in order, where the result of some of those steps may affect later steps.  With such problems, jumping around and attacking it from the middle using multiple "workers" doesn't work so well.  So this model has served those types of programs well, which are really still very common.  (That is, until 3D graphics rendering became common...)
The above model has been optimized and modified over the years, of course.  And work has progressed in making sure less of the CPU is idle as time goes on.  Even as early as the 68000 you had "pipelining", where multiple instructions are actually "in-flight" in various parts of the CPU (and this is why branch prediction was developed, because if you have multiple instructions pipelined, and then have to throw away the results because of a branch, you lose performance).  Today you have additional things that prevent the CPU from stalling or waiting for something, like:

cache (prevents CPU from having to wait on slow memory sometimes)
out-of-order execution (rearranges fetched instructions into an order that executes more efficiently)
register renaming (allows out-of-order execution to work better, by giving instructions their own copies of registers while other instructions finish their work)

So, each processor or core contains a number of subsystems that work together to interpret and execute an instruction stream.  In a sense parts of modern CPUs are indeed working on something and other parts are working on something else, at the same time.
But, While they can be made very efficient using the above techniques, ultimately they are all working together on the same instruction stream.  So they cannot be totally independent from each other.  If you want to execute two instruction streams at once, you need two CPUs or cores.
A modern multitasking OS is bouncing between various instruction streams stored (i.e. programs) in memory.  What the OS does is cut off the program when it takes up too much of a time slice (most CPUs designed for multitasking environments have a timer that causes an IRQ after a certain interval, or such similar mechanism), or switch over to another task if the process is waiting on some type of I/O or input.  It never physically executes two instructions at once on a single CPU.
I think something like the idea you are talking about was tried with the Itanium and it's VLIW architecture.  Read that Wikipedia article, it explains things a bit better and more in-depth than I'm trying to here.
Answer: Actually "switching tasks" part is performed by an OS. Processor is a relatively "dumb" piece of hardware that just "crunches numbers". From a technical point of view, processor can't work on more than one task, because all tasks are written in assumption that they have full control of a processor at the time of execution. This is partially a legacy because of required backward compatibility.
With a multi-core processor more than one "full processor" available, so more than one program can have "full processor" available at the moment, so they can be executed simultaneously.
Comment: Yeah, I know that they're literally just crunching numbers, and everything needs to be mathematical, is it the processor or the OS that has that backwards compatibility "full processor" thing though? Thanks for the answers btw.
Comment: Both processor and OS have to deal with backward compatibility, but processor is much more restricted in that sense, since it should be compatible with any OS or program that runs on it (Windows, Linux, etc.)
Answer: The OS could only run ONE thread of a process on ONE core at the SAME time, but once you know that one process is divided into multiple threads by the OS before they can run on the Core, and any modern OS is normally running around 100 or more processes, you will be able to imagine how fast the switching happens, if the Core is clocked at 1 GHz it will refresh around a billion times per second to free up "space" for the upcoming threads to execute.
Recently, in Intel processors, you may have heard of their Multi-Threading technology, which makes ONE core be ABLE to run TWO threads at the exact SAME time, theoretically doubling the Core performance.
Comment: It won't switch threads more than around a 100 times a second (switching is rather exensive). And the hyperthreading technology gives around a 5 to 20% performance for the second thread for one processor (or at least that were the measurements I saw when it came out or a bit later).
Comment: Yes , the refreshes made by the Clock Frequency are meant to free up the processor from the currently executing instructions, it would have nothing left to do if it was switching threads a billion times per second. I am sure it won't exceed the 20% performance increase mark, and that's exactly why I said "theoretically" but in real world usage, normal users will rarely see any difference.

How do multi-core CPUs work?


Did Dumbledore already know this?

Question: Did Dumbledore know that Harry Potter would die or not? What happened to the stone which was gift of death?
Comment: Why did harry throw that stone which is gifted by death
Answer:
Did Dumbledore know that Harry Potter would die or not?

Dumbledore already knew that Harry would die. And it was necessary to kill Voldemort.
When Harry looks into Snape's memory, we can see Dumbledore and Snape having a conversation at Astronomy Tower.

Snape: So when the time comes, the boy will die.
Dumbledore: Yes. He will die. And Voldemort should do this.

We can see here that Dumbledore knew that Harry will die.

What happened to the stone which was gift of death?

It is called The Resurrection Stone. Harry used this to call his parents, Sirius, and Lupin.
Last time we saw, this stone was dropped by Harry on the ground in the forest.
Comment: Harry already heard the story of Three Brothers in HP 7.2 and there is no use of reviving his family. Harry was also one of his Horcruxes and when the part of Voldemort inside him was needed to be killed in order to kill Voldemort. There were only 7 horcruxes only, not 8.
Comment: @supersaiyan Actually, Tom says to Prof. Slughorn he'd like to split his soul into 7 parts. That means that he wanted 6 objects to contain part of his soul, such that there are 7 total soul parts. To split your soul into seven parts, you need six Horcruxes. Harry is the seventh (pseudo) Horcrux that Voldemort didn't know about, and didn't intend to exist. More info on the Horcruxes [here](http://harrypotter.wikia.com/wiki/Horcrux#List_of_Voldemort.27s_Horcruxes)
Comment: If he could revive anyone then why he hadn't revived all of his family
Comment: One more thing according to Voldemort he had to make 7 horcrux and according to the Dumbledore Harry was the horcrux which was not known to the Lord Voldemort then Harry had destroyed six horcrux what about the 7th
Comment: Because Harry was the 8 horcrux as voldmort didn't know about harry
Answer: Dumbledore actually knows that Harry would not die. There is a bit towards the end part when Harry tells him Voldemort took blood from his body. Dumbledore then realizes that the protection that Lily provided also now runs in Voldemort's body. There by he makes a good 'guess' that Harry wouldnt die - as he tells Harry during the dream/imaginary conversation he has with him at what seems like "King's Cross Station".. Again covered well in the book.. not so much in the movies

Did Dumbledore already know this?


How do I learn the in's and outs of email, spam, and exim

Question: I recently got a new job, and realize that I'm way to ignorant on mail troubleshooting. How do you recommend learning how to read email headers, mail logs, and troubleshoot various mail problems? any good books? tutorials? anything else? is the documentation comprehensive enough to start there?
Answer: The extensive Exim documentation and the book by the Exim author are good places to start, to get an idea of how to make things work and consequently what can go wrong. Whilst they focus on exim configuration and use, they also discuss more general email topics. You should then consider setting up some different mail servers for some essential hands-on experience, and to understand how they work with other systems like DNS.
Answer: I'm going to be somewhat facetious here and recommend RFC 2821. That's as good a place to start as any.


Buzzing sound coming from Audi A3 2.0 TDI engine

Question: This is an '05 A3 with a 2.0 TDI BKD engine, about 120k miles on it. The sound starts when I move the key to the ON position, without starting the engine. But even with the engine on, it's still there, and it stops about 10-20 seconds after I remove the key. What could cause this? Here's a video of the sound
Comment: I'm thinking this is probably the EGR valve fluttering ... I know there is a valve which Audi's have had an issue with which do exactly this ... I wrote an article on it ... when I get home I'll look it up ... NP80? "Something" 80 valve. Not sure if the TDI has the same valve as the gas engine does, though ... I'll see if I can find it when I get home.
Comment: Can you narrow down where the sound is coming from? Something that loud I'd imagine you could put your hand on and feel for what's buzzing.
Comment: Okay, I was thinking of the [N80 EVAP purge valve](http://www.audiworld.com/how-tos/a/audi-a4-b7-how-to-replace-evap-purge-n80-valve-421193). This applies to Audis with the 2.0TFSi engine, so I doubt it is your issue with the TDI.
Comment: Could be a fuel pump - if you get outside the car with the ignition on, you should be able to roughly hear where the noise is coming from.
Comment: Thank you for your answers guys. I tried to pin down the source of the sound and I think it's coming somewhere from around the EGR valve as Paulster2 said. [Picture](https://i.imgur.com/qIzIMxU.jpg), the highlighted part is where I hear it the most, OEM part no. 038128063G, which google tells me is called throttle body, but I can hear it from the EGR valve next to it too (I used the screwdriver as stethoscope method). This morning however the sound was much quieter, you can barely hear it with the hood down. It was a whole different story yesterday. [Video today](https://streamable.com/eqld)
Comment: Did you get it sorted out?
Answer: That's the anti-shudder valve (ASV), D, in the image below (from an article on how to delete the EGR/ASV – not a good idea on a diesel as the ASV provides some measure of protection against a runaway) it should be fixed open (and I would think quiet) when the car is running. This video "Noise of a Anti Shudder Valve / Inlet Manifold Flap ready to blow" is similar and suggests impending doom (or at least failure of the valve). If the valve fails open, you probably wouldn't notice anything by the quiet (barring a runaway), but if it failed closed then you wouldn't be able to start the engine (or at the very least power would be severely limited).


Some of my posts aren't listed in "Activity"

Question: I haven't found an answer to this question in Help. But maybe someone can point me to it. I'd like to know why some of my posts do appear in my Activity page, and some don't. I posted four answers to other people's questions within a few hours of each other. Two of the posts are in Activity. The other two aren't. I'm just wondering what the reason for that would be.
Answer: At least one of those answers was deleted. It was an answer to this post. Not sure if you can see the deleted answer there yourself, but users with 2k+ rep can still see it. I voted to delete the answer (and it was eventually deleted by a moderator), because it didn't really answer the question, didn't contain any useful information, and involved an attack on the OP.
Please see: How do I write a good answer?, Why and how are some answers deleted?, and the FAQ for Philosophy.SE.


USB stick modem stopped connecting after upgrade to 11.10

Question: my USB stick modem does not connect after upgrading to 11.10. It worked ok on 11.04. It is found now (the connection called "O2 Default 1" in my case is active), however it does not connect automatically as it used to do and when I try to connect it manually it shows "Home network selected" or something for a second and than it disconnects (and when trying to connect again, it says "Modem network disconnected" immediately).
Thanks for your help, it is needed(-:
Answer: I had the exact same problem with my rogers nokia usb stick, I got mine working by disabling the ubuntu control over WLAN and downloading the linux driver from the nokia website, it did give me some warnings when installing the driver but it works.


How can I desaturate a color in illustrator

Question: say I have a hexidecimal values or rgb values of a color in illustrator, how could I decrease the saturation easily and following the same tone in illustrator? Thanks
Comment: Given the duplicate link, you can set Recolor Artwork to "global sliders" then just decreased the Saturation slider.
Answer: Illustrator uses HSB (Hue Saturation Brightness) color space. If you want to change only the saturation itself:

Open the color picker
Paste the color you want to modify into the color picker
Select S for saturation and change the option's value.
Answer: If you have lots of objects and dont need the transparency you can lay over a white square over your artwork and put transparency to saturation mode. Thi de saturates the color entirely you can now use transparency to bring the saturation back. You can do the same per layer with applying extra fill with the same idea in a layers effect, YMMV.
You could also script this.
Answer: Just to add on to the above answer — if you open the 'Color' window (Window > Color in the AI menu), you can select your desired color editing mode from the upper right-hand menu. Like this:

Select the object with the fill or stroke color you want to modify
Make sure your color window is visible and expanded (use the arrow symbol in next to the window title in the tab bar)
Select 'HSB' from the dropdown menu of the color window (upper right)
Change the 'Saturation' slider


Are there any security advantages to activating VLAN tagging?

Question: I understand the concepts of generating a VLAN.  However, on a small, closed, sophisticated network, are there any security advantages to activating VLAN tagging?
Comment: Take a look: http://security.stackexchange.com/questions/1551/why-do-people-tell-me-not-to-use-vlans-for-security
Answer: The security part comes from using VLANs. Users and devices on one VLAN cannot communicate with users and devices on another VLAN, except through a router. This gives you the opportunity to place restrictions (firewall, ACLs, etc.) on the VLAN-to-VLAN communication.
VLAN tags are used on a trunk, where traffic from multiple VLANs travels, in order to tag the frames so that switches know which frames belongs to which VLAN. Most end-devices don't understand VLAN tags on frames, and tagging frames to an end-device will usually result in the frames being dropped. This part isn't really about security, except where it helps keep the traffic separate on trunks where there is traffic from multiple VLANs.
Comment: Respectfully, this is wrong because no network security comes from VLAN segmentation itself.  NGFW's can operate at layer 2 / transparent mode and stateful inspection / ACL's by themselves can be applied in the absence of a VLAN segmented switch.
Comment: The question, "_...are there any security advantages to activating VLAN tagging?_" is directly, and correctly, answered by my answer.
Answer: By themselves, VLANs do not have any security advantages.  But using VLANs, as @ronmaupin hints at, allows you to place access control lists to restrict traffic flowing from one VLAN to another.  So, for example, you can restrict users on a insecure VLAN from reaching devices on a more secure VLAN.
You would use VLAN tagging if you have more than one VLAN on a physical port.
Comment: Some devices such as Brocade use 'tagging' as the means to configuring basic VLAN for a physical port, i.e. you enter VLAN mode then apply physical ports to it (opposite of Cisco).  This may be where the OP is coming from,..
Answer: This is more about forming layer 2 boundaries for frames and segmenting your traffic than security, it does help to some degree because without layer 3 ip routing the traffic from each vlan only knows about vlans allowed on trunks connected to that host...trunks carry multiple vlans and connect layer 2 environments with the ability to allow specific vlans on each trunk or allow all (  bad idea).
When a layer three Virtual routed interface is added to a vlan then it can be connected to other layer three vlans spanning subnet and network boundaries. This of course requires a router or layer three switch along with a routing protocol to dictate the rules of traffic flow connectivity etc.....
Answer: Yes.
Devices on the same L2 domain can be vulnerable to each other. ARP spoofing, Mac spoofing or MAC flooding techniques can be used to intercept traffic. Protocols other than IP may be running and not as well protected as IP. Some software firewalls default to trusting devices on the local subnet. Some switches have features to mitigate these issues but they are bolted on as afterthoughts, in some cases you may find your switches have protection features for IPv4 but no corresponding features for IPv6. It is also difficult to firewall between devices on the same L2 domain.
Splitting up the L2 domain allows you to reduce your exposure to L2 weaknesses and allow you to put firewalls in place to control communications between different parts of your network.
You could do this splitting by building physically seperate networks but that is expensive and error-prone. VLANs with tagged trunks allow you to realise much of the security benefit of seperate networks without the high costs.
Answer: None.  Security vulnerabilities are unaffected by layer 3 hops; they are usually embedded in applications.
Comment: What security does VLAN segmentation provide?  I am genuinely interested in hearing and learning..
Comment: The question is not about VLAN segmentation security benefits. It is about the security benefits of VLAN tags. That is a very different question. In my answer, I explained that VLAN tags have nothing to do with security. Security should be layered, and not allowing two devices on the same switch communicate because they are on different VLANs is one legitimate layer of security.


The moon: how to determine its size, speed and distance from earth using a simple telescope?

Question: Assuming I only have a simple telescope, how can I determine the size of the moon, its angular velocity and distance from earth?
Comment: @uhoh pencil, paper, telescope, geometry and not much more.
Comment: Do you have any of these also: pencil, paper, value of [G, the gravitational constant](https://en.wikipedia.org/wiki/Gravitational_constant) & mass of earth, or just the value of the [GMe, standard gravitational parameter of earth](https://en.wikipedia.org/wiki/Standard_gravitational_parameter) of earth? Or even just the fastest speed that you've seen a satellite move relative to the stars?
Comment: The telescope is redundant, Aristarchus, Hipparcus and Ptolomy did this (and rather more) with essentially naked eye observations, knowledge of elementary geometry and the equivalent of pen and paper. You need the angle between the Sun and Moon at 1/2 Moon (you might need something equivalent to a sextant for this), the angular size of the Moon and the radius of the Earth's shadow on the Moon during a Lunar Eclipse in units of Moon radii, and the actual size of the Earth.
Answer: Finding the distance is tricky. To find the distance you need to carefully note the position of the moon (relative to the stars ) from two different places, *at the same time *.  The moon will appear to be in a slightly different position from the two viewpoints (an effect called paralax). That done, finding the distance, and size is a simple exercise in trigonometry, and Khan academy has a page which shows hoebto find the distance to the moon.
Greater accuracy could be obtained by measuring the time that a star is hidden by the moon, from two locations, and using that to determine the position of the moon to greater accuracy than possible by direct measurements.  Hipparchus apparently used a solar eclipse to obtain two positions atbthe same time needed for calculation of paralax.
Knowing the distance makes finding the diameter and speed simple to do, by observing the angular size, and using a little trig.  Working with photographs takenby the telescope is convenient but not strictly necessary.


What should I do after accepting my husband's oath not to take tea from me?

Question: My husband asked me to accept his oath that he wouldn't take tea from me.  As I was angry, I said yes, but now he blaming me for accepting his oath. But my point is that no one should accept someone else's oath by asking someone. What should I do?
Comment: Was the swear taken by any of the unique names of Almighty Allah (e.g. Allah) or a name that when uttered reminds of Him only?
Answer:
Making an oath, also known as swearing an oath
An oath [...] is either a statement of fact or a promise [...]
A promise is a commitment by someone to do or not do something.

In your case you swore to an action that will not be performed by you but by someone else which by definition is meaningless, therefore the rules of vow/oath will not apply.
But if you mean that you husband swore, which cannot be read from the question in it's current state, not to take tea from you after you said yes even then I don't think the rules of vow wouldn't apply because:

the oath was involuntary but rather influenced by your decision
most probably was taken in a state of excitement
the act should be normal or usual to sensible people, or to the person himself.

Now says the vow was valid meaning the above criteria are not met, then your husband has to give Kaffarah/penalty/compensation by either:

setting free a slave
fully feeding ten indigent/poor people, or providing them with clothes
or if the above isn't possible then he should fast for three consecutive days

Source: Ayatollah al-Sayyid 'Ali al-Husayni al-Sistani


Sharepoint Online- Fillable form for external users

Question: I'm new to Sharepoint Online (and SharePoint in general) and have a question about external sharing. I would like to create a form that would need to be filled out by multiple different users and use a workflow to route the form to said users. However, one group of these users is an external group who need to simply give their approval. I understand that I cannot share an InfoPath form with external users. Is there any other solution I may be able to use?
Answer: Since InfoPath Forms Services are only supported in Office 365 Enterprise E3 plans or higher, if external users want to access InfoPath forms, they need to login with credentials. More information you can check in the article:
InfoPath Forms Services and External Users
There is a workaround which use Word and email to external users, check if it's feasible for you:

Create content type with relevant columns which you want external users filled in.
Create a word document and use quick parts to insert the columns to the file.
Use word email feature to send the file to external users and external users email back after filling the file.

More detailed steps check the post: External Form Submit to SharePoint


flash player doesn't work in explorer 8

Question: Flash player doesn't work in explorer 8 ( Windows 7 64 bit ) , I can't load the pages which use adobe flash. If I disable flash plug-in, the pages can be loaded but naturally without flash animations . It doesn't make auto updates. Chrome works without problem. What can I do ?
Answer: You could try upgrading to a more recent version of Internet Explorer. IE8 is over six years old.
Answer: Updating to IE9 didn't work but  I updated later Flash. Version 11.1.102 works properly on IE9

flash player doesn't work in explorer 8


Exchanged UK for EU (Spanish) driving license - impact on ability to hire a car

Question: I have held full uk driving license for 30 years and am in the process of exchanging it for a Spanish one. Given that almost all car rental companies require you to have held your license for at least a year, when I receive my new Spanish license can I use it to hire a car in the uk immediately or will I have to wait a year?
Answer: I exchanged my British driving licence for a Spanish one in 2012. Unlike the British licence, the Spanish one doesn't have a counterpart: all the information on validity is on the plastic card. This includes a table on the back showing your entitlements. Mine shows class B valid from the date I passed my test in the UK (in 2003). It also has an "Observations" field with a code which says that my original licence was from the UK.
Note that you may lose special entitlements. My UK licence had a ton of special classes, but my Spanish one only has class B. Still, that's what matters for hiring a car.
Comment: the UK License hasn't had a paper counterpart for 5 years now either.
Answer: As per this article from an automobile magazine, you will probably get a license with an special code with key 106.3 with the first issuance date, so you should be able to provide proof of experience.
I'm not sure if this code is a national code or a EU-wide code, though.
Comment: That might be for non-EU licences which have been exchanged. My Spanish licence has observation code 70, with the number of my original UK licence, but not code 106.
Answer: As of right now (pre-Brexit) you can use your EU driving license in the United Kingdom. There is no need for you to wait for anything.
If and when Brexit happens it is unclear what the policy will be.
Comment: The question relates to the fact that many rental agencies require you to have held a license for at least a year before permitting you to hire a car from them. This answer does not address that fact.
Comment: After Brexit, the worst case would be that you can use an EU licence to drive in the UK for up to a year of residency.


Can a lightning strike ionise the material it strikes?

Question: I know lightning strikes ionise the air, but I'm looking into geology, specifically amethyst, and found that it gets its colour partially from trivalent iron, iron(III), Fe 3+, whatever you want to call it. Normally this happens by radiation during the formation of the amethyst, but I'm curious if a silica crystal with trace amounts of normal iron could be struck by lightning to ionise it and remove the additional electrons, thereby finalising the creation of amethyst, or am I missing some details about lightning and/or amethyst?
Answer: There are Fulgurites.

Fulgurites are formed when lightning strikes the ground, fusing and vitrifying mineral grains.


"completely" usage confusion

Question: As I know, verbs are followed by adverbs. So, which is true?
"She stands there completely expressionlessly"
Or "she stands there completely expressionless"
Though I think the second one is likely to be true, I can't find out a satisfactory explanation. Thanks in advance!
Comment: Probably the best explanation is using two consecutive ***-ly*** forms sounds "awkward" to the native ear. Plus we often avoid "adverbial" *-ly* forms completely in contexts where the uninflected adjective can be used instead. So it's often *"Come quick!"* rather than *"Come quickly!"*.
Comment: "Completely" is a red herring here. The question would be the same if the word "completely" were removed.
Comment: The adverb means that she is standing in an expressionless manner, which doesn't really make sense; rather, *she* is expressionless, so the latter sentence is the better one.
Comment: "completely" is redundant and superfluous. You are either expressionless or not, you can't be partially expressionless. Something can't be "completely" destroyed either.
Answer: expressionless is modifing she, not stands, so it should be an adjective, not an adverb. It's equivalent to

She's standing there and is completely expressionless.

An example where you could use an adverb is:

She's standing there completely effortlessly.

The use of the adverb completely is irrelevant. An adverb can modify either an adjective or adverb. Both sentences would be the same with or without it.
Comment: Yes: _stand_ is used here as a link-like or link+main (my terms) verb. That is, it performs a linking function (between subject and adjective), but also has semantic content (standing as opposed to squatting, sitting ...). I'd call this role of 'completely' the adjective-modifier role rather than the adverbial role. Many words (perhaps one should say _intercategorial polysemes_) do dual duty like this.
Answer: Adverbs ordinarily precede the adjectives or adverbs they modify, so that is why in your examples "completely" precedes the adjective "expressionless" or the adverb "expressionlessly", which it modifies.  "Completely" can also modify a verb, in which case it can precede the verb it modifies: "They completely missed my point."  However, it can also follow the verb phrase: "They missed my point completely."  This particular type of adverb does not occur at the beginning of a sentence: *"Completely they missed my point."  Nor can it occur before an auxiliary verb: *"They completely have missed my point."  But many other adverbs can occur in the two latter positions.
The position of adverbs depends on what the adverbs modify, but unfortunately not in any simple way.
Both "expressionless" and "expressionlessly" are possible in your example, and "completely" can precede and modify either one, since adverbs can modify both adjectives and other adverbs.
Answer: "She stands there completely without expression."
Avoids the awkwardness of two -ly words in a row and ensures that "without expression" correctly modifies "stands".

"completely" usage confusion


Is there any UX guidelines to be considered for Android desktop widgets?

Question: While designing an android desktop widget is there as UX guidelines to be followed? what are the steps to be taken care while designing an widget?
Answer: UPDATE: We've published new guidelines for App Widgets for Android 4.0:
http://developer.android.com/guide/practices/ui_guidelines/widget_design.html
These include a PSD template package.

Although this isn't comprehensive, I have some PSD and PNG templates that may help with the visual design of app widgets:
http://code.google.com/p/android-ui-utils/source/browse/misc/appwidget-template
Also, most design guidelines remain true for app widgets. I've put together some slides on design tips that can help.
Some more widget-related tips:

Make sure the widget layout is accessible via directional (D-pad, trackball) navigation. There are still a lot of Android devices with directional navigation hardware.
Make the widget deep links into your app when possible, for whatever content it is showing. If deep links don't make sense, the widget should at least jump into your app's home screen.
Do not occupy an exorbitant amount of space—user's home screens are sacred, and you must respect them. A 4x4 or 3x3 app widget is rarely necessary.
Offer a customization step during the widget-adding process if you have a lot of content.
Don't refresh too often; be conscious of battery implications. If allowing users to customize the widget refresh interval, expose this setting in the app's settings, and not during the widget customization step.
Be unique and be true to your brand, but adhere to system widget design themes and behavior. For example, customize the background color and show your logo, but use proper dimensions, shadows, and interactivity behaviors.
Comment: Also remember that as of Android v3.1 widgets can be set to be resizable vertically and/or horizontally, which is great as it means the app could just have one widget that shows more/less depending on how big the user wants it. Many apps currently include lots of widgets and it's a pretty ugly experience.
Comment: Why not have the update frequency in the widget customisation? Say I have a widget which shows location dependent data. Is the correct place to set how often the widget updates in the app for the widget? The app itself only needs to update when the users runs it so this setting would only be used in the widget. Any advice?
Comment: The reason for offering widget update frequency settings in global app settings is that it gives the user better control without needing to remove and re-add the widget. If your app settings are not very discoverable or otherwise useful, it may make more sense to include widget update frequency in the customization step. But that is *not* a common pattern.


Travelling to Berlin and taking a cruise from Rostock halting at Norwegian Ports

Question: I am travelling to Berlin and then going to Norway. Can I get a sim in Berlin which will be usable in Norway as well? Need majorly for data and GPS.
Answer: Yes, you can.
A recent EU regulation did away with roaming charges in the EU, which is what you may have heared before. But it's only half true. The EU roaming regulation covers all of the EAA (European Economic Area). This includes Norway, which is otherwise not a member of the EU. So if you buy any SIM card in Berlin, you will be able to use the roam like home option in Norway.
But there has also been a change in the registration rules for SIM cards. Until mid 2017 you were able to pretty much buy a SIM and register it under the name of Donald Duck under any existing address of a place you may have picked on Google Maps. Now you will need to present an ID document to have your card activated. As a result, prepaid SIM cards are available in less places than before and you may need to plan some time for the activation, though that should not be a big issue in Berlin.
Please also note that while on the cruise ship, your GSM device might switch to a satellite backed on-board maritime network. You can use that network for plain text messages and you will be able to make and receive calls, just at rates that are far from affordable.
Comment: Thanks for the info - any particular service provider i f you can recommend whose services are good in Germany as well as Norway
Comment: @smodi when you go to a different country, you will always switch to another network. That's called _roaming_. The coverage of your own provider is thus not really relevant. For Germany only, it depends. You will probably want a pre-paid one, not a contract. If all you want is Berlin and Rostock, you're fine buying a Lycamobile or Lebara card in a Spätie ([see my answer here](https://travel.stackexchange.com/a/55944/6792)). Those will work in Norway as well with the new regulation, and you might even be able to buy top-up credit there. If not, make sure top up enough before you go.


Fast file reading in golang

Question: I have a very large file and i need to process each line (each line of file is independent). How can I use goroutines (or should I not use them?) to read the file in the fastest way?
Comment: See http://stackoverflow.com/a/10677087/1643939 for the question if you should make reads with multiple threads or not.
Comment: Note that goroutines are not threads (necessarily). But the point stands.
Answer: As long as your hard disk is orders of magnitude slower than your CPU, which is still a quite common situation, then you cannot magically make the file reading (domain: from a single HD) any faster by throwing more CPU cycles onto it. (Assuming cold file caches and/or file size much bigger then all available file cache memory).
Answer: As in pretty much all cases the disk I/O is the limiting factor, and not the CPU cycles, you will not get an advantage in pure reading throughput by using goroutines.
Instead, you should check if you can use concurrency one step later, after reading a line. If your processing of a line takes a bit of processing or waiting (maybe you analyse it, or send it somewhere else?) concurrency may be useful: passing it to another or several other go routine(s) so reading can go on in this goroutine.
Answer: Also you should try to read memory page sized blobs of data to maximize the throughput (reading two half pages is slower than reading one full page). The page size depends on your OS/Kernel configuration.

Fast file reading in golang


Why Moro's power draining dont work in Majin Buu?

Question: Moro's power draining made him able to defeat Super Saiyan Blue Goku and Vegeta. But in the fight with Majin Buu there isnt any sign they are working at all. Why Moro's power draining dont work in Majin Buu?
Answer: Majin Buu used the Supreme Kaioshin's magic to defend himself against Moro's power drain.
As explained in Dragon Ball Super's chapters 48 - 49, a team of Galactic Patrol hypno-therapists managed to awaken the dormant consciousness of the Supreme Kaioshin within Good Buu. (As a reminder, Good Buu is called as such because the Supreme Kaioshin's appearance and personality influence him).
Majin Buu is now able to swap his consciousness with the Supreme Kaioshin's at any time. The Supreme Kaioshin already fought against Moro and developed several magical countermeasures, which notably protect him from Moro's power drain.
Answer: There is no information as of now regarding this question. However it is safe to assume that there may be some flaws in Moro's draining power. The way or who the power could be absorbed from may play a part in this.


One Word vs. Multi Word YouTube Channel Name

Question: I'm getting ready to create a channel name with three short words. I'm trying to decide if it would be better to mash them together into one word or keep separate words. Searches for the subject only find people talking about how to create a one word channel, not why. I noticed that the trending and recommended videos on the front page are a mix of mashed together words and multi word names. Any advice on which would be better and why is appreciated. Thanks!
Comment: Looking at Writing SE posts, I don't think it would be welcome there. I noticed these posts here: [Monetizing...](https://video.stackexchange.com/questions/12870/monetizing-youtube-channel-with-videos-containing-cc-licensed-content?rq=1), [Starting...](https://video.stackexchange.com/questions/29767/starting-a-youtube-channel-advise-questions-tips?rq=1) and [Will a Youtube...](https://video.stackexchange.com/questions/30583/will-a-youtube-video-with-clips-from-a-copyright-protected-anime-website-animei) and thought this might be the right place.
Comment: That's not a video question. A channel name is like finding a title for your œuvre. The question may fit better to https://writing.stackexchange.com/
Answer: I don't think it really matters. People do both all the time. It really all just comes down to the content you provide, using appropriate tags on each video, and being consistent with your postings.
Answer: If you mush all three words together, it will make the name harder to understand. On the other hand, having all three words as one word may make the name more recognizable, if the name you chose is a common phrase. If your name is three words, when people look it up, they may find videos about that topic listed above your channel. This would limit your early exposure, as people looking for videos about Video Editing Explained (or whatever your channel will be called) would probably find videos about that listed above your channel. I light of that, putting your three words together as one word would probably be better.