Psychiatrists use a diagnosis criteria for major depression that arbitrarily overlook the continuum of symptoms of varying severity and duration.

Eleven years after astronomers witnessed supernova 1987A, a shock wave from that cataclysm has begun ramming into a surrounding ring of gas.

Studies of two proteins suggest how the deadly Ebola virus avoids the immune system and infects cells.

A tiny tube made from a stack of ring-shaped peptides allows small ions to pass from one side of a membrane to the other.

New fossils show that deep-rooted land plants appeared at least 10 million years earlier than previously thought.

Global warming may boost the intensity of the strongest hurricanes.

African wild dogs burn more energy than predicted during a day, an insight that has forced scientists to rethink the energetics of chasing down dinner and worry about the dogs' loss of food to hyenas.

The part of a male canary’s song that really excites females—a rapid-fire two-note trill—may be so difficult to produce that it gives clues about the physical condition of the singer.

Fruit flues exposed to crack cocaine exhibit behavioral responses similar to those displayed by crack-addled humans.

Scientists have used a vastly more efficient method of cloning to produce two identical calves.

Consuming folate and vitamin B₆ at levels well in excess of the recommended daily allowance may lower the risk of heart disease and stroke.

Prolonged microwave cooking can inactivate much of the vitamin B₁₂ in foods.

In the human brain, one neural system perceives the defining qualities of objects whereas another directs visual control of skilled actions.

 Detailed pictures of DNA polymerase show how these enzymes create new DNA strands.

Patches of partially molten rock at the bottom of Earth’s mantle may profoundly influence conditions at the planet’s surface.