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It's not the size of the brain, it's the size of the brain in relation to the size of the body, and the surface area of the brain. Sperm whales have big brains, but not enough brain power to defend themselves against a smaller, smarter predator. We may be getting more convolutions, which would mean more brain power in less space.
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"I believe that being despised by the despicable is as good as being admired by the admirable."
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