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Body & Brain

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girls playing soccer

HARD KNOCKS Girls had almost twice the annual rate of concussions as boys when researchers compared sports — soccer, basketball and baseball/softball — that both played.

market in Dongguan, China

POULTRY PROBLEMS  So far, most cases of human H7N9 infection have come from exposure to birds, often in live poultry markets. Here, epidemiologists collect samples at a market in Dongguan, China, in 2014.

incubating chick

BASIC BEAK  The red- and blue-stained facial features of this chick, which was incubated under standard laboratory temperatures, reveal an upper beak that is developing properly.

Body & Brain

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