A federal agency wants to hold a hearing about the causes of a chemical accident in West Virginia, but Bayer is trying to limit what can be disclosed.

Dr. Grene helped shape a modern philosophical approach to biology that strives to interpret the deepest meanings of the scientific study of life, including the meaning of humanness.

An arid expanse of California desert at the southern end of the San Andreas Fault is being wired with sensors that scientists hope will tell them when the state’s sleeping giant could awaken.

The shuttle Discovery left the International Space Station with a fresh crew, a complete set of solar arrays and a repaired water recycling system.

As Congress debates new emissions restrictions, an underlying question is how much more Americans will be willing to pay to harness the wind and the sun.

Will the planet change gradually as it warms, or face sudden disasters?

Consumers who are trying new compact fluorescent bulbs say they sometimes fail to work, or wear out early.

On loan from Florence to Philadelphia, a telescope used by the astronomer gives you an idea of how hard it must have been for Galileo to be Galileo.

Barbara Strauch, who coordinates health coverage, answered questions.

How did Freeman Dyson, the world-renowned scientist and public intellectual, wind up opposing those who care most about global warming?

Dr. Wood, a physiologist, was an essential member of the team that invented a revolutionary pressurized garment, the G-suit, that helps pilots avoid blacking out while in flight.

Charles Simonyi, a software developer, began his second paid trip to the International Space Station on Thursday.

Federal officials are asking people to stay out of caves in states from West Virginia to New England, where as many as 500,000 bats have died from a disease called white-nose syndrome.

Officers with the State Department of Environmental Conservation have become more prominent as awareness of pollution’s role in global warming has grown.

For the first time, scientists have tracked an asteroid headed for Earth, watched it explode in the atmosphere, and studied remnants found on the ground.

The director of the E.P.A. said that the agency planned an aggressive review of permit requests for mountaintop coal mining, citing concerns about potential harm to water quality.

Many Americans, particularly those of East Asian descent, are ignoring an unusual cancer warning sign, researchers say.

In the animal kingdom, a male’s grand display of weaponry can discourage lesser rivals.

Difficult cases raise questions about who is fit to become a doctor.

As the E.P.A. prepares to regulate heat-trapping gases, it is embarking on an ambitious regulatory challenge.