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The founder of Blackwater USA, the security company providing support in Iraq, is testifying before a House committee Tuesday. Committee members questioned founder Erik Prince about his company's involvement in Iraqi civilian deaths.

The problems in the housing and credit markets are leading to more layoffs on Wall Street. Investment bank Bear Stearns says it will trim 310 jobs from its mortgage group. Merrill Lynch fired two senior executives.

The decline of the U.S. dollar has been detrimental to the ability of American aid agencies to provide assistance overseas. Michael Rewald, a director of the humanitarian group CARE International, discusses the impact of the weak dollar.

A petition before the Food and Drug Administration could change the way parents care for children with colds. Many pediatricians cite a lack of evidence that cough medicines are safe or effective for young people.

Some worry that the proposed Pebble Mine in southwestern Alaska will end up poisoning the largest native sockeye salmon run in the world. But the company hoping to mine the tundra for copper and gold says it could keep contaminants sealed up and that fish would be unharmed.

Three scientists will share the Nobel Prize in Physiology or Medicine for their pioneering work in the fields of "gene targeting" and embryonic stem-cell research. The discoveries, made over the past three decades, laid the groundwork for understanding how genes work.

Fifty years ago, a basketball-sized satellite went into orbit. Sputnik's successful launch ushered in vast changes in space exploration and in relations between two superpowers. For one commentator, it was the beginning of a more personal journey.

Tickets to a reunion concert of the pop group in London sold out in 38 seconds this week.

Most of us were taught that Christopher Columbus discovered America. Yet it is far from clear cut. There are alternative theories about who got here first — some well-documented, others much more flimsy in their scholarship. A new book probes their merits.

In South Africa, 3,000 gold miners are being rescued from under ground after an accident that cut power to the mine's elevator. The miners who have been brought to the surface are doing well. There have been no injuries or deaths.