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Body & Brain

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depressed woman

PRECIOUS TIME  Investigations that equip volunteers with smartphones indicate that suicidal thoughts fluctuate in signature ways over just a few hours. Closer scrutiny of these thinking patterns may lead to advances in suicide prevention.

teens

TEEN HEALTH  The latest national survey on teen health behaviors finds that fewer teens are having sex than at any time since 1991, the first year the survey was conducted. But condom use has recently gone down, putting more teens at risk for sexually transmitted infections.

Nut-free food

FOOD ALLERGY LINK  A large population-based study finds a connection between allergies, including those to foods, and autism spectrum disorder in kids. But having such an allergy doesn’t mean a child will develop autism, scientists say.

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