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Molecular Evolution

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THE HIGH LIFE  The Tibetan plateau, shown outside the town of Aba, is high, cold and has little oxygen. Scientists now say a genetic variant that helped Tibetans adapt to life on the high-altitude steppe came from extinct people known as Denisovans.

FAMILY SPLIT  Chimpanzees have a much slower mutation rate than previously estimated. That could mean that humans and chimps last shared a common ancestor 13 million years ago.

Based on weight, humans use energy in their muscles differently than chimps do, a new study shows.

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