You may want to ask the student to send you any material that you need for writing your reference, for example grade sheets and a CV. Bringing in your personal experiences with the student in addition shouldn't be a problem at all. After writing the reference letter, you should erase all confidential material that the student sent you... :)

Should I write a recommendation letter for a student at a previous job/institution?
I wonder how I can hear what direction a sound is coming from.

I believe that the brain calculates relative to the volume from each ear, meaning I'm unable to know what direction a sound is coming from if one of my ears are not working.

But what if the sound is perfect in front of me? Or Above? (Both ears are hearing exact the same) Can I then still hear where the sound is coming from?
