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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.

Discover some of the best up and coming Nashville musicians.

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.

Georgia environmental groups hosting energy town hall in Athens.

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.

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.

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.

A little more than a month before her 40th wedding anniversary, Joan Didion's beloved husband — novelist John Gregory Dunne — died unexpectedly. Didion has written a book about his death, The Year of Magical Thinking.

Senate's top Republican says the Supreme Court's role is to protect basic rights, even when majorities are in favor of something else. "That happens all the time."