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NASA engineers are struggling to get to the bottom of a mysterious technical problem that scrubbed Wednesday's planned launch of the space shuttle Discovery. Astronauts were already on board when word came that the launch was a no go. They now need to wait at least days if not weeks for another chance.

Echinacea has been widely used to treat the common cold, but a new study finds the herbal remedy has no effect on the virus that causes the infection or on the illness that results. Past studies have had similar results. But the message doesn't seem to sink in with consumers.

Robert Siegel talks with Reza Aslan, author of No God but God: The Origins, Evolution, and Future of Islam. Aslan talks about the significance of the fatwa against terrorist attacks on civilians by the Fiqh Council of North America. He explains what a fatwa is, and who can issue one.

North of Alaska, the deepest part of the Arctic Ocean goes more than a mile down and is locked in ice. An international team of scientists is probing this so-called Hidden Ocean, from a U.S. Coast Guard icebreaker. NPR's Richard Harris sends an audio postcard from the expedition.

In January, 1st Sgt. John Campbell and his wife Paula were preparing for his deployment to Iraq -- and for the arrival of twins. A month ago, while John was in Bagdhad, daughters Taryn and Taylor were born. John recently returned for an all-too brief visit with his new family.

In the second installment of a weeklong series on the end of the Vietnam War, Michael Sullivan looks at Hanoi, once the capital of North Vietnam and now the capital of a nation reunified under communist rule.

When you sip tea, slurp noodles or sample hors d'oeuvres from a piece of hand-thrown pottery, there's a good chance you're experiencing the reach of American potter Warren MacKenzie. We visit the artist in his studio.

When he was President Bush's top budget advisor, Mitch Daniels had a reputation as a tax-cutter. But since becoming Indiana's governor, he has proposed a tax increase to help solve the state's budget troubles.

The former head of WorldCom takes the witness stand again Tuesday at his trial on charges of accounting fraud. Bernard Ebbers insisted Monday that he was unaware of the massive fraudulent accounting that took place at the company between 2000 and 2002.

A tenuous peace holds in Sadr City between U.S. forces and followers of militant anti-American cleric Moktada Sadr. Shiite militiamen who were shooting at U.S. soldiers last summer are now helping man Iraqi police checkpoints and assisting in reconstruction.