> I saw an interesting lecture (Carl Sagan, I think?) who pointed out that 
> if we were the size of insects, we'd barely notice gravity and we'd be 
> much more concerned about surface tension, for example.

Yeh, this comes about because gravity forces, mass and inertia etc all scale 
with length cubed, but surface tension scales with length squared.  This is 
an important concept in Engineering when making very small things.

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