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NASA scientists confirm that a space probe has hit its comet target. They hope the collision will reveal clues about how the solar system formed.

Concerns about evacuation from any high-density area have been raised after the traffic jam in Texas. John Copenhaver, president of the Global Partnership for Preparedness, and a former FEMA regional director, offers his insights.

Grammy Award-winning R&B singer Luther Vandross has died at the age of 54. A hospital in New Jersey did not release the cause of death, but officials did say Vandross had never fully recovered from the stroke he suffered two years ago.

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.

The United States is requiring AIDS groups that take government funding to adopt an explicit policy opposing the sex trade. The requirement has already prompted Brazil to turn down $40 million in U.S. funds. Groups say the requirement could make it more difficult to work with at-risk groups, such as prostitutes.

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.

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.

Pulitzer Prize-winning novelist Philip Roth has been a favorite of readers since his memoir Goodbye, Columbus emerged to help define the culture of postwar America. Now the Library of America is releasing Roth's books — a rare step for a living author.

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.

Iran is threatening to use trade and oil supplies as weapons against countries that voted against Tehran at a recent meeting of the International Atomic Energy Agency. The IAEA approved a resolution referring Iran's suspect nuclear program to the U.N. Security Council for possible sanctions.