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Body & Brain

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SNOOZING JELLY  Some Cassiopea jellyfish regularly enter a sleeplike state, a new study finds.

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About 20 percent of U.S. adolescents have had at least one concussion. Those teens were more likely to play competitive sports than those who never had a concussion.

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BUSY BRAIN The still-forming brain of a frog sends important messages to the body. When the brain is missing, the body doesn’t develop properly, a new study suggests.

Body & Brain

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