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Physiology

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fruit fly heartbeat graph

KEEPING TIME  Fruit flies that eat just 12 hours per day (blue lines) maintain steady heartbeats into middle age (5 weeks old), while the hearts of flies that can eat around the clock (red) beat irregularly. Each red or blue dash represents the contraction of the heart.

chili peppers

HOT STUFF  Capsaicin, the stuff that gives chili peppers their heat, relieves pain by a previously unknown process.

pill man

TOUGH TO SWALLOW  Antioxidant pills may not help athletes after all.

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