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/snip/ the "why" questions are often asked by students, and by most people.This question certainly resonated. I can usually shrug off this physics desire
And teachers answer them, without difficulties. For example:
*) Why do cars gain speed when moving downhill ?
Because of the net force. And we elaborate.
*) Why do we have day in New York when it is night in Tokio?
Because of the earth rotation. And we elaborate.
*) The shape of the moon changes from day to day; why is it so?... etc. etc.
Ludwik
http://csam.montclair.edu/~kowalski/life/intro.html