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This year's Nobel Prize in Chemistry will be split by two scientists from the Israel Institute of Technology and an American from the University of California, Irvine. They discovered how living cells carefully select the materials inside them that need to be broken down and recycled. NPR's Renee Montagne talks to NPR's Richard Harris.

For the second time in a week, the House ethics committee rebukes Rep. Tom DeLay, the House majority leader, for questionable conduct. It also warned the Texas Republican to temper his behavior. The panel criticized DeLay for conduct that appeared to link political donations to legislation. Hear NPR's Andrea Seabrook.

Two Italian aid workers are released by their captors after being kidnapped and held hostage for three weeks. The women, Simona Pari and Simona Torretta, both 29, were handed over to the Red Cross along with two Iraqi workers who were held with them. NPR's Sylvia Poggioli reports.

A privately financed craft succeeds in taking a pilot into space for the second time in less than two weeks. In doing so, SpaceShipOne wins the so-called X-Prize of $10 million for the team funded by Paul Allen, a founder of Microsoft. NPR's David Kestenbaum reports.

The top U.S. commander in northern Iraq says that this week's deadly attack on a U.S. base near the city of Mosul may have been the work of a suicide bomber wearing an Iraqi military uniform. Brig. Gen. Carter Ham says he is concerned the attack's success may encourage similar attempts. NPR's Vicky O'Hara reports.

U.S. and Iraqi forces move against insurgents in the area known as the "triangle of death," south of Baghdad. U.S. commanders say they need to press into neighborhoods where rebels have taken refuge. Iraq's defense minister has signaled that another offensive is planned for the capital itself. NPR's Anne Garrels reports.

Efforts are under way to arrange a ceasefire in the Baghdad slum of Sadr City, where militiamen loyal to Shiite cleric Muqtada al-Sadr have been battling U.S. forces. Sadr's aides have been negotiating with officials of Iraq's interim government, but no deal has yet been announced. NPR's Emily Harris reports.

President Bush and Sen. John Kerry hit the campaign trail after the first presidential debate of the 2004 campaign, seeking momentum in attracting voters. Kerry spoke in Florida, while President Bush visited Pennsylvania and New Hampshire. Hear NPR's Scott Horsley and NPR's Don Gonyea.

President Bush announces Michael Leavitt as his choice for secretary of Health and Human Services, replacing Tommy Thompson. Leavitt, a former governor of Utah, is now administrator of the Environmental Protection Agency and was not among the expected choices. NPR's Don Gonyea reports.

Former New York police commissioner Bernard Kerik has withdrawn as President Bush's nominee to head the Homeland Security Department. Kerik cited questions about the immigration status of a housekeeper/nanny he employed. Hear NPR's Scott Simon and NPR's Don Gonyea.