There were a couple major changes in the last month . Pokemon used to spawn for 15 minutes . They now spawn for 30 minutes . On average , if you are walking around , you will see twice as many Pokemon as before . They changed it so there is more variety in the types of Pokemon that spawn . There are fewer Pidgeys now . Sorry , I don ' t use scanners . Niantic has been cracking down on them . <| sep |> can do a social authentication with Facebook and it will automatically match the likes of your target person and suggest something . <| sep |> I ' ve heard of people also using the bernoulli principle to explain airplane lift , but that is incorrect 12 airplanewrong 1 . html . The amount of lift generated by the velocity difference over and under the wing is insufficient to lift the airplane , and angle of attack is what keeps planes aloft . It is similar with car wings . The bernoulli principle is used for ground effects create downforce via low pressure zones under the car , but even that effect is more due to cross sectional area changes . The angle of attack of the wing acts to generate downforce by deflecting air upwards .