Stories by Karen Wright

Whether they're counting minutes, months or years, biological clocks help to keep our brains and bodies running on schedule

The connections between neurons get weaker, not stronger, when we sleep—and that keeps brain cells from becoming overtaxed by waking events

Whether they're counting minutes, months or years, biological clocks help to keep our brains and bodies running on schedule

Whether they're counting minutes or years, biological clocks keep our brains and bodies on time, perhaps even on schedule for death

Whether they're counting minutes, months or years, biological clocks help to keep our brains and bodies running on schedule

A national park struggles to rid itself of a charismatic ungulate

Biologists crane to see the canopy

Automakers turn to high technology in the search for a car that is clean, safe—and fun

The evidence on cholesterol is subjected to interpretation

Policy initiatives could turn the tide on wetland loss

Are deep-water divers risking their bones and brains?

Digital audio is changing film sound. Will audiences notice?

Biologists find limits to tinkering with reproduction

Drug-resistant viruses surface in AIDS patients

More evidence links genes and intelligence

Finicky flies lend credence to a theory of speciation

Controversy and liability are limiting contraceptive options

Advertising's infatuation with physiology has cooled

A microorganism responds to a vertebrate hormone

Biologists finally corner the rare forebear of all blood cells

Subtle chemistry helps a cell to read the genetic code

A study of adoptees suggests there is no escaping heredity

How does lithium counter both mania and depression?