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Just A Bit Of DNA Helps Explain Humans' Big Brains

04:27
The size of the brain of a chimpanzee (right) is considerably smaller than that of a human brain. Probably multiple stretches of DNA help determine that, geneticists say. (Science Photo Library/Corbis)
The size of the brain of a chimpanzee (right) is considerably smaller than that of a human brain. Probably multiple stretches of DNA help determine that, geneticists say. (Science Photo Library/Corbis)

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