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Paleontologists announce finding an animal skeleton that may bridge the gap between fish and the first four-legged land animals. The 375-million-year-old creature, with a head like a crocodile's, has a body built for swimming. But its front legs are a compromise between fins and feet.

Dealing with a potentially fatal cancer is difficult for anyone. Doctors with cancer face a special challenge. They're used to giving medical care, not getting it. Two doctors, Elizabeth McKinley and William Tierney, share what they learned as patients.

Mindy Kleinberg's husband, Alan, was a securities trader with Cantor Fitzgerald, working on the 104th floor of the north tower of the World Trade Center. Kleinberg has watched some of the Zacarias Moussaoui trial on closed circuit TV, at a satellite courtroom in Newark, N.J., set up for victims' families. Melissa Block talks with Mindy Kleinberg.

Former House Majority Leader Tom DeLay plans to give up his seat, one week after one of the Texas Republican's top aides pleaded guilty in the corruption investigation of lobbyist Jack Abramoff. In addition to a tough battle for re-election, DeLay is facing corruption charges in Texas.

The Senate sidetracks sweeping immigration legislation after a preliminary vote shows it lacks the support needed to pass intact. Steve Inskeep speaks with Congressional Correspondent David Welna about the setback.

Since it was invaded three years ago, Iraq has lost more than $10 billion in oil revenues. Corruption and sabotage are largely to blame. And U.S. and Iraqi officials say insurgents are benefiting. But many say the Oil Ministry's own militia is at the heart of the problem.

Actor, comedian, composer and musician Michael McKean is best known for co-starring in the spoofs This Is Spinal Tap, Best in Show and A Mighty Wind. He is currently co-starring in the Broadway revival of The Pajama Game.

Don't expect a pullout of U.S. troops from Iraq in the near future. An increase in sectarian violence and U.S. dependence on Middle East stability -- largely because of oil-supply concerns -- argue against leaving Iraq.

New York Times environmental reporter Andrew Revkin has covered climate change and climate politics for 20 years. His new book The North Pole Was Here: Puzzles and Perils at the Top of the World is geared toward young adults.

With crude-oil prices hovering at or above $70 a barrel, more people are looking for alternative sources of energy. Others are asking how long existing sources will last.