Why can't some teens resist taking risks?
In a nebula packed with stars, not all stay with the crowd.
New maps of global forests show where they are disappearing.
Mood disorders are linked to disturbances of circadian rhythms.
DNA analysis reveals a new—and deadly—strain of flu.
When oil spills invade ecosystems, impacts can last decades.
Scientists decode large parts of the Neanderthal genome.
Genetically speaking, how close are we to Neanderthals?
Asteroids may have delivered water to early Earth.
The Census of Marine Life is studying an ocean's worth of microscopic marine species.