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NASA's Deep Impact spacecraft successfully crashed into Comet Tempel 1 early Monday. Scientists arranged the collision in an effort to learn more about the comet's physical makeup.

President Bush is in Texas Sunday for a briefing on the damage caused by Hurricane Rita. He spent Saturday at Peterson Air Force base in Colorado Springs, Colo., monitoring the storm and the federal response.

The company first arrived in Russia in 1851 to deliver devices for a major telegraph line. It primarily does maintenance work on high-speed trains these days — though it's now winding down operations.

South Korean researchers say they've made a significant advance in the production of human embryonic stem cells. They can now use far fewer human eggs to produce usable stem cells — a major step toward mass production. Researchers hope these cells could eventually be used to treat a wide variety of diseases.

In 1944, an Italian prisoner of war was found hanged at a U.S. Army base near Seattle. The trial of three black soldiers that followed was the Army's longest during World War II. Jack Hamann's new book says it ended in a miscarriage of justice.

The NY Times did an exhaustive survey of the Fox News host's broadcasts. Reporter Nicholas Confessore says Carlson's show is based on ideas that were once "caged in a dark corner of American life."

Newsweek has retracted a story from its May 9 issue that set off deadly riots in Afghanistan and other Islamic countries. The item alleged that U.S. interrogators at Guantanamo Bay put a copy of the Quran into the toilet while questioning prisoners. Newsweek attributed the story to an unnamed source at the Pentagon.

Scientists recently surveyed the sea beneath the ice of the Arctic Ocean and discovered a number of exotic new species. But climate change could mean a big shift in the biodiversity of this largely unexplored region of the planet.

The head of New Orleans' police department, Eddie Compass, has resigned. This weekend, he announced that 249 officers, or about 15 percent of the force, are absent without leave after the hurricanes. A special tribunal will determine who has deserted and who has legitimate absences from work.

Michael Brown, former head of the Federal Emergency Management Agency, vehemently defended himself in a Capitol Hill hearing on the government's response to Hurricane Katrina. Brown said limited resources and a lack of cooperation from state and local officials hampered FEMA.