http://www.youtube.com/watch?v=maKTpFXjro4
Synopsis(?): Woman: What is diffential wheel? Man: In a curve, inner wheel rolls slower than the outer wheel. That's d.wh. W: No, the outer wheel just rolls a longer distance. M: .... W: If a man walks a longer distance, he doesn't need to go any faster than when walking a shorter distance. ..... W: the right foot does not walk any faster, it just takes longer steps. .... W: If your right foot would go faster than your left foot it would be home from work earlier than youf left foot!
