Science

Risky Spacewalk Saturday to Mend Solar Array

In the procedure an astronaut will be out on the end of a 50-foot-long boom gripped by the space station’s robotic arm, either unsnagging or cutting a wire.

Mayors, Looking to Cities’ Future, Are Told It Must Be Colored Green

A summit convened by the U.S. Conference of Mayors presented two main themes: the federal government must do more to fight global warming; and in the meantime, cities must take up the slack.

Texas Proceeding With Plan to Auction Preserve

Texas is collecting bids from private buyers for a 9,270-acre tract of wildlife preserve, setting off a conservationist uproar.

Effort to Save Everglades Falters as Funds Drop

Seven years into an $8 billion effort to rescue the Florida Everglades, federal financing has slowed to a trickle.

• Video | Bush Vetoes Water Projects Bill

The Blue Planet’s Lifeblood: A Finite Flow

The American Museum of Natural History’s show is enlightening, yet frustrating: It presents a free-flowing flood of data and has an overly insistent and predictable message.

• Slide Show

Repairing Solar Array Is New Focus of Spacewalk

Mission managers at NASA have put off a spacewalk in order to focus on repairing a torn solar panel on the International Space Station.

Safety Data Is Forthcoming, NASA Chief Tells House Panel

NASA has previously said that the data, which comes from tens of thousands of interviews with pilots about safety issues, could damage the airline industry.

Washoe, a Chimp of Many Words, Dies at 42

Washoe captured the world’s attention and set off a debate over nonhuman primates’ ability to learn human language that continues to this day.

A Quake in the Bay Area Raises Concerns

Tuesday night’s 5.6 magnitude quake near San Francisco set off worries among scientists that the tremor could be a precursor of worse to come.

Why They Called It the Manhattan Project

The first headquarters of the nation’s secret effort to build the bomb lay in New York City.

• Interactive Map: The Manhattan Project's Hidden Sites
• Video: An Atomic Tour of Manhattan

Low Buzz May Give Mice Better Bones and Less Fat

New research suggests that in mice, a simple treatment that does not involve drugs appears to be directing cells to turn into bone instead of fat.

SLIDE SHOW: Artistic Conservation

Stephen Nash's pencil and ink drawings have become valuable tools in helping locate rare species and persuading people to help conserve them.