[nitpick]
Actually, DMark, I believe it has been shown that a very slight amount of surface turbulance is aerodynamically beneficial to a runner, so shaving your arms might actually slow you down!
[/nitpick]
[Hijack!]
What about wind driven electrical generators? If we covered the surface of the land and the oceans with these things to generate electricity, would they affect the rotation of the earth?
er-
For a start, they would act like trees, and distribute the weight of the earth a little outwards, thereby slowing it down by a few picoseconds, but how about the energy they extract?
Where does it come from?
Where does it go?
[/Hijack!]
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