I hope you fell off your bike when you were a kid. Maybe you broke your arm. I say this not because I'm a mean person, but because that early experience portends one of two things: either a lifetime devoted to the study of physical processes and their limitations or a fear of bicycles. If you are reading this magazine, I'll bet it's the lifetime of study.rnYou were the kid popping wheel-ies, probing the limits of unstable equilibrium. On the playground swing set, you swung the highest because you understood resonance. Every time you jumped from that swing, you tested your knowledge of gravity, the naturernof inelastic collisions, and bruised ankles. Such doings shape the mind of a budding engineer. I mean that in a serious way.
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