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Scientific research has always been one of the main arguments for developing NASA's manned space flight program and the International Space Station. But as the future of the program comes under scrutiny in the wake of the Columbia disaster, critics argue that most of the work doesn't require humans at all. NPR's Joe Palca reports.

NPR's Lynn Neary talks with New York Times reporter Ben Weiser about Attorney General John Ashcroft's decision to pursue the death penalty in 12 cases in New York and Connecticut, against the wishes of local federal prosecutors.

House Majority Leader Tom DeLay (R-TX) has sponsored a change in House ethics rules to allow members of Congress to take free trips to charity events. One such event is the spring excursion sponsored by DeLay's own foundation for the benefit of foster children. NPR's Peter Overby reports that the rule change has critics crying "foul."

We read from listener comments to the program including thoughts on our coverage of the cost of medical malpractice insurance, our series on debt and the food Lewis and Clark's expedition survived on during their expedition.

The United States "burned" some intelligence sources when Secretary Powell told the U.N. Security Council yesterday what those had revealed. But American intelligence agencies believe the sources were not of great importance and contend that the loss of sources was outweighed by the need to convince the world that Iraq still conceals illegal weapons programs. NPR's Mike Shuster reports.

NASA's investigation into the Columbia disaster is now wide open. The space agency says there's just not enough evidence to back the theory that damage to the shuttle's protective heat tiles caused the crash. At today's memorial service for the Columbia astronauts at the National Cathedral in Washington, D.C., NASA chief Sean O'Keefe pledged the agency would find the cause of the accident and continue with space exploration. NPR's Richard Harris reports on the progress of the investigation.

In a story broadcast on Morning Edition on Jan. 22, 2002, National Public Radio said it had called the Traditional Values Coalition to ask if that group had been contacted by the FBI, investigating the mailing of anthrax to Senate offices. This report violated NPR editorial principles. No one had told our reporter that the Traditional Values Coalition was a suspect in the anthrax mailing. No facts were available then or since then to suggest that the group had any role in the anthrax mailing. NPR deeply regrets this mistake and apologizes for any false impression that the coalition was involved in this investigation.

A new study predicts 40 percent of Americans will soon be obese, and scientists conceded that changes in metabolism that come with weight gain make reducing difficult. Researchers in Colorado are focusing on prevention, which takes less sacrifice and effort than many might believe. NPR's Richard Knox reports.

Secretary of State Colin Powell tells the Senate Foreign Relations Committee the Iraqi weapons matter will be brought to conclusion "within weeks, one way or another." Meantime, there's skeptical reaction from France and many Muslim countries to Powell's U.N. presentation on Iraq Wednesday. Hear reports from NPR's Michele Kelemen, NPR's Nick Spicer and Khaled Al-Maeena, editor-in-chief of Arab News.

The White House and Congress react to North Korea's suggestion it might launch pre-emptive attacks should it feel threatened by the United States. The administration calls the threat "saber rattling." But senior Democrats in the Senate demand the situation be treated as a crisis. NPR's David Welna reports.