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Communities from Houston to New Orleans opened cooling centers to bring relief as steamy hot temperatures settled across a broad swath of the U.S. South on Saturday.

Sen. Hillary Clinton and Sen. Barack Obama sparred Monday night at a Democratic debate in Myrtle Beach, S.C. Each accused the other of deliberately distorting the truth for political gain.

Turkey's military sends troops and fighter jets into northern Iraq overnight. In Baghdad, Shiite cleric Muqtada al-Sadr announces he will order his powerful militia to continue its cease-fire for another six months.

The New York Times says the point of an article that implied John McCain had an improper relationship with a lobbyist was about his inability to see how his behavior might look to others. His behavior in financing his campaign is also being questioned.

The gunman in Thursday's shooting at Northern Illinois University had stopped taking his medication and became erratic before opening fire inside a lecture hall, police say. Five people were killed before Stephen Kazmierczack killed himself.

Space and resources are strained in the western city of Lviv. More than 200,000 Ukrainians have temporarily settled in the city while Russian airstrikes continued this past week.

Thanks to a long history of migration, many Portuguese speak many different languages, and that's a big draw for European call centers. It's one of the few bright spots in Portugal's bleak economy.

President Bush announces the resignation of Defense Secretary Donald Rumsfeld at a White House news conference. In a later media session, Bush and Rumsfeld shared a podium with Rumsfeld's successor, former CIA chief Robert Gates. Melissa Block talks with NPR's John Hendren.

Condemnation from the United States and other nations may be just what the Iranian president needs to shore up a shaky political position at home.

The 2007 Nobel Prize in physics will be shared by two Europeans who discovered the physics that allows computer hard drives to compress large amounts of data. The prize was awarded to Albert Fert of France and Peter Grunberg of Germany.