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SAN FRANCISCO — A half-century record of history has melted away from the Naimona'nyi glacier in southwestern Tibet, highlighting the changes coming to glaciers across the Himalayas.

Air-breathing fish that can hop and walk across the floor on their fins hint that walking may have evolved underwater before such animals began migrating on to land, scientists find.

Many explanations for the gender gap in math skills don't hold up, suggests new research on math skills and gender in 86 countries.

Mothers who have jobs are healthier than those who are not employed, at least when their children are very young, a new study finds.