1. Big Brains, Small Testicles

    News.com.au: "Women have suspected it for millennia, and scientists have finally proved it - men cannot have both big brains and big testicles.

    Brainiacs and scholars everywhere may gnash their teeth, but according to a recent study of bats, nature forces the males of a species to make a painful trade-off between mental capacity and sperm production.

    Because of the high-energy demands of both brains and sperm, scientists believe males cannot generate large amounts of both."

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