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Kraft was among the earliest employees of NASA and designed mission control and other components of the program. He became head of the Johnson Space Center and oversaw the birth of the space shuttle.

Students returned to the campus for classes for the first time since 17 people were killed in a shooting rampage at the Florida school.

Even after a Harvard team took into account differences in age and weight among ancient specimens and knees today, they found that modern humans tend to have more osteoarthritis.

Tom Grove of The Wall Street Journal discusses the state of relations between the U.S. and Russia after Moscow's announcement that it would order the Washington to reduce its diplomatic staff.

U.S. officials say Saddam Hussein's regime appears to have lost hold of Baghdad, but caution there may be additional fighting ahead. From Qatar, U.S. Brig. Gen. Vincent Brooks says the situation in Iraq has reached a "tipping point" and that the population is beginning to recognize the Iraqi regime is "coming to an end." Hear NPR's Nick Spicer.

An American soldier is killed and another wounded outside Baghdad when their convoy is hit by rocket-propelled grenades and small-arms fire, U.S. Central Command says. The attack comes a day after Gen. John Abizaid, commander of U.S. forces in Iraq, predicts that resistance to American troops will increase in the coming months. Hear NPR's Guy Raz.

U.S. officials confirm that recent attacks on an Iraqi police station and a civil defense compound in Fallujah were carried out by Iraqi gunmen -- not foreign operatives, as authorities initially believed. The mayor of Fallujah has been detained by U.S. forces, under the suspicion that he might have collaborated in the attacks. NPR's Deborah Amos reports.

Maj. Gen. Geoffrey Miller, who commands U.S. detention facilities in Iraq, visits the Abu Ghraib prison and formally apologizes for the abuses committed there by U.S. personnel. Reporters were given a tour of the facility as former inmates gathered to protest the abuses. Hear NPR's Eric Westervelt, NPR's Peter Kenyon and NPR's Jackie Northam.

U.S. forces enter the town of Samarra, north of Baghdad, for the first time in months, in a bid to reinstate the town council and police force in part of Iraq's rebellious Sunni triangle. U.S. troops clashed with insurgents in nearby Fallujah. Hear NPR's Michele Norris and NPR's Peter Kenyon.

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.