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Anthropology

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WALK IT BACK  A new analysis of 3.6-million-year-old footprints excavated in 1978 at Laetoli, Tanzania, challenges the argument that early hominids strode in much the same manner as people today do. Shown is a cast of two of the 70 footprints.

GETTING BIGGER, MAYBE  Scientists disagree about whether a Homo erectus boy from 1.5 million years ago, represented here by a cast of the child’s skull, had a modern, humanlike teenage growth spurt.

GOOD BET?  Income gains from a new or expanded casino might go hand in hand with improved body weight in Native American children, a study finds.

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