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March 18, 2009


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I may be wrong, but I don't think this is a question which has a
simple, scientific answer. Science isn't always good at "why"
questions. Spiders have eight legs because their ancestors had eight
legs. Nature's tendency toward bilateral symmetry makes an even number
of legs a "given," but the abstract concept of a functional spider
doesn't absolutely require eight legs, rather than six or ten or
twelve. Eight legs is just what they've got.

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