On Wed, Feb 14, 2018 at 3:07 PM, <agrayson2...@gmail.com> wrote:

*​> ​Mother Nature did come up with a wheel; a rotating tail on some
> specie. I forget its name. AG*

The words
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that have slipped your mind are
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and its microscopic, that's why I said "macroscopic". It's easy to make a
part that moves in 360 degrees if its microscopic because nutriments can
just diffuse in and waste products diffuse out; but as parts get bigger the
volume increases by the cube of the radius but the surface area only
increases by the square, so when things get big diffusion just isn't good
enough. Evolution never figured out how to do better and make a wheel large
enough to see, but people did.

John K Clark

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