> How come molecules "push" and "pull"? How come the strength varies?

The "push" and "pull" Warp is referring to (I guess) are the forces caused 
by a pressure difference.  This causes the next "bit" of air to be moved, 
thus creating another pressure difference, and the next bit moved, etc, this 
is how the wave propagates - it's the same as a longitudinal wave in a 
slinky spring.

Of course at a molecular level "pressure" is caused by colliding molecules 
etc, but I don't think you need to work at this level of detail to model how 
sound waves propagate, you can just assume that each bit of air has a 
pressure, and pressure differences will generate forces.

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