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I thought the testicles thing was an example of "good enough" evolution, where they evolved as far as they had to. If your other defences are good, the risk of injury there is minimized, and so is the evolutionary effect. How many guys ever suffer injuries there, sufficient to render them infertile? (Any kids here whose dads were skateboarders?)
Permalink Thu, 15 May 2008 00:11:00 UTC | #171269