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Fossil hunters have found the earliest known common ancestor of a group of mammals that includes humans. About 125 million years ago, the chipmunk-like Eomaia scampered around bushes, eating insects and dodging dinosaurs. NPR's Richard Harris reports for All Things Considered.

Over the past century, the Earth's surface has been getting hotter. Scientists had thought icy Antarctica was a part of that global warming trend, but two new studies show temperatures on the continent may be heading south. For Morning Edition, NPR's Richard Harris reports.

Washington, D.C. is full of buildings that are prime targets for a terrorist's wrath, and planners are thinking of new security measures that might also help preserve the city's photogenic beauty. NPR's Alex Van Oss reports on the bollard, the Jersey barrier and the Ha-Ha -- Saturday on Weekend All Things Considered.

To workers at the Harris Beach law firm, their office on the 85th floor of the World Trade Center's south tower was their "acre in the sky." NPR's Madeleine Brand reports on the firm's efforts to recover in the six months since the Sept. 11 attacks.

Most antibiotics are discovered by studying microscopic organisms that live in the soil. Yet 99 percent of all these microbes are still unidentified, with their biological riches untapped. On Thursday's Morning Edition, NPR's Dan Charles reports that scientists are just beginning to explore this unseen world.

On Friday, one of the most ambitious animated films from Japan opens in U.S. theaters. It's called Osamu Tezuka's Metropolis, and it's inspired by Fritz Lang's 1927 silent film of the same name. Beth Accomando of member station KPBS reports for Morning Edition.

A controversy over school integration in San Francisco has spurred the city's normally apolitical Asian-American community to action. As Holly Kernan reports for All Things Considered, the issue shows just how powerful this constituency has become in California.

NPR's Ivan Watson reports that Sierra Leone's civil war seems to be ending and rebel commanders are turning over hundreds of child soldiers to the United Nations. The UN estimates that some 5,000 child soldiers saw combat during the 10-year civil war.

NPR's John Nielsen reports on the growing number of radical eco-terrorist groups. These groups advocate sabotage and economic injury as the only ways to get the attention of the organizations they are fighting. The extreme strategies of these groups -- from arson to the mass destruction of bioengineered plants -- have some in the field afraid to go to work.

Baghdad's nearly 5 million residents prepare for a war that seems inevitable. The streets of Baghdad are surprisingly calm, and a top aide to Saddam Hussein appears in public to refute rumors he had defected. NPR's Anne Garrels reports.