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Body & Brain

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Zika DNA vaccine

GIVE IT A SHOT  A Zika vaccine that’s made of DNA could be a safe and fast way to protect people from the virus, which can cause birth defects.

kids clapping in preschool classroom

Happiness may be contagious among preschoolers, a new study suggests.

testosterone test-tube

LOW T  As men age, testosterone levels in the blood tend to drop. Replacing the hormone through testosterone treatments brings an assortment of benefits and potential problems.

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