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Earth

Arctic ozone loss in 2011 unprecedented

Report describes a ‘hole’ comparable to conditions observed over Antarctica during the mid-1980s.

Life

2011 medicine Nobel goes to immunology researchers

The prize in physiology or medicine recognizes scientists for their work on the body's innate and adaptive defenses against invading pathogens.

Space

Longer cosmic ruler based on black holes

A new method promises to improve the precision of extreme astronomical distance measurements.

Psychology

Teen daters pal up to the bottle

Buddies of boyfriends and girlfriends push teens toward or away from booze.

Physics

Sweet beams: Lasers to measure blood sugar

Cutting-edge use of light might someday prove useful in gauging diabetics’ glucose levels.