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The 2004 Nobel Prize in Physics is awarded to three Americans for their insights into the fundamental structures of matter -- the forces that bind together quarks. David Gross, David Politzer and Frank Wilczek showed how tiny quark particles interact, helping to explain how a coin spins -- and how the universe was built.

Saying "Thank you, America," Interim Iraqi Prime Minister Ayad Allawi tells a joint meeting of Congress that "liberty and democracy" are taking hold in Iraq, and vows elections will take place as scheduled in January. Allawi meets with President Bush at the White House Thursday.

British Prime Minister Tony Blair is in danger of losing his job as his Labour Party begins its conference in Brighton, England. Blair has been pressured to step aside over his controversial Iraq policy. Hear NPR's Anthony Kuhn and NPR's Liane Hansen.

U.S. officials closely monitor what they call worrisome new data on North Korea's nuclear activities after a large unexplained explosion was reported over North Korea Thursday. Experts seek to determine whether North Korea is preparing to test a nuclear weapon. NPR's Vicky O'Hara reports.

Retired general Wesley Clark campaigns in Tennessee ahead of Tuesday's primary, looking for a critical second win in the race for the Democratic presidential nomination. Clark draws distinctions between himself and senators John Edwards and John Kerry, saying his tax plan offers middle-class families more benefit than those of his rivals. Hear NPR's Greg Allen.

The White House is expected to release new information Tuesday about President Bush's military service, including attendance records and other documents related to his time in the Air National Guard. Democrats have recently revived charges that Bush failed to fulfill his duties in the Guard during the Vietnam War. Hear NPR's Bob Edwards and Boston Globe reporter Walter Robinson.

President Bush defends the U.S.-led war in Iraq during a visit to Charleston, S.C. Bush says the invasion of Iraq was "the right thing to do" based on intelligence available at the time. The United States has not yet found any weapons of mass destruction there. Hear NPR's Don Gonyea.

European Union representatives hold an emergency meeting in Brussels, Belgium, to consider ways to prevent terrorist attacks in the wake of last week's deadly bombings in Spain. EU ministers support speeding up the use of biometric identifiers on passports and visas, and tentatively agree to appoint a special coordinator to oversee its various counterterrorism efforts. NPR's Emily Harris reports.

Rocket-propelled grenades fired at a hotel and nearby store in downtown Baghdad cause structural damage but no reported injuries. Earlier, in the southern Iraqi city of Basra, a car bomb outside a popular hotel killed at least four people and left several others wounded. The blast came less than 24 hours after a massive car bomb attack in Baghdad. NPR's Ivan Watson reports.

The worsening security situation in Iraq has prompted U.S. military commanders to prepare contingency plans for sending additional troops to the country. U.S. commanders have not requested additional forces, but they are considering whether more troops trained in rapid-response techniques are needed. NPR's Eric Westervelt reports.