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BODY & BRAIN
Some U.S. presidents go gray in four years, but they still tend to live longer than average. See “Presidency not a death sentence.”

A program in Nepal enlisting motorbike owners as emergency transport saves the lives of people bitten by snakes. Read “Scooters save lives of snakebite victims.”

GENES & CELLS
Tiny hairlike appendages on cells can sequester a protein involved in regulating appetite. Read “Cilia control eating signal.”

MOLECULES

Cosmetics and other compounds wafting off tourists’ skin threaten a masterpiece. See “Saving the Last Supper.”

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