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Geologists and other scientists warn that unless the wetlands that buffer New Orleans are rebuilt soon, the new New Orleans will get flooded again. At the same time, confusion surrounds exactly what should be done or how long it will take or cost.

NASA releases plans for a new spacecraft that would replace the space shuttle. The vehicle is part of a system that will be capable of putting astronauts on the moon by 2018, laying the groundwork for space travel to Mars. NASA says the new system is designed to be 10 times safer than the space shuttle.

Yesterday, 10 people were killed and three wounded in a mass shooting in a Buffalo supermarket that appears to have been racially motivated. The shooter is in custody.

Michelle Kwan's withdrawal from the Winter Olympics opens the door to Emily Hughes, 17, the younger sister of 2002 gold medalist Sarah Hughes. Renee Montagne talks to USA Today columnist Christine Brennan about the U.S. figure skating team's prospects in Turin.

A report from investigators in the House, due for release Wednesday, is expected to fault all levels of government in the response to Hurricane Katrina. Authors of the report, "A Failure of Initiative," outline 90 serious flaws in the response -- ranging from ineffective leadership at the Department of Homeland Security to inadequate state and local plans for evacuation to a "fog of war" at the White House.

President Bush and his aides ponder their course of political action as the administration seeks to recover from Friday's indictment of a senior White House official and the withdrawal of Supreme Court nominee Harriet Miers.

I. Lewis "Scooter" Libby, the most powerful aide to the most powerful vice president in the nation's history, is indicted by a federal grand jury. The news further rocks a White House struggling with a variety of second-term problems.

Two anesthesiologists threw the death penalty in California into turmoil this week when they walked out of the execution of a convicted murderer. The doctors objected when the state asked them to do more than observe the execution. Now death penalty experts wonder whether other states will have the same problem.

That holiday tree in your living room seems fresh, but it was probably plucked from the farm earlier this month. Tom Banse has an insider's look at the industrial operation to bring trees to market.

Reversing earlier statements, London authorities now say a man plainclothes officers trailed to a city subway station and then shot to death Friday had no apparent connection to the bombings of July 21. Police have yet to name the man.