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Body & Brain

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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.

cancer cells

OXYGEN DEPRIVATION  Cancer cells (shown in blue) surround a blood vessel (red) in a mouse tumor. Cells on the tumor’s edge are dying, starved of oxygen. But treatments to starve tumors have come up short.

Body & Brain

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