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All Things Considered Ethicist Randy Cohen stops by to tell host Jacki Lyden about one of the precepts of ethics -- utilitarianism. And we have advice for a listener: Is a teacher ethically obligated to read the evaluations his students write about him?

Anyone can have a big idea. But how do those big ideas come to fruition and grow? Director of the TED Fellows program Shoham Arad walks us through several speakers who turned a spark into a movement.

The Justice Department prepares legislation that would broaden the government's power to gather intelligence and fight terrorism. But some say the expansion of the 2001 Patriot Act would give authorities too much unchecked power. NPR's Jackie Northam reports.

Russian Defense Minister Sergei Ivanov says North Korea is a potentially greater threat than Iraq. Meanwhile, a Japanese newspaper reports that the government has plans to mobilize its military in the face of a possible missile launch by Pyongyang. NPR's Jacki Lyden talks to NPR's Rob Gifford.

A panel of former NASA engineers and military officials prepares to take over the Columbia investigation. More than a week after the space shuttle broke apart upon re-entry, NASA says it has no clear answers. NPR's Jon Hamilton reports.

The Pentagon will ask Congress for relief from six environmental laws, including the Clean Air and Endangered Species acts. Defense officials say the regulations protecting threatened plants and animals on military property are compromising combat readiness. NPR's Elizabeth Arnold reports.

Janet Heimlich follows a search team in East Texas looking for remains of the space shuttle Columbia.

In an effort to reduce costs, American Airlines asks its unions to make concessions worth nearly $2 billion annually. The Fort Worth, Texas-based company also closes two reservations offices and announces 750 flight-attendant layoffs. Bill Zeeble of member station KERA reports.

A week after it posts the largest loss in corporate history, AOL Time Warner works to get back on its feet. But the media giant, which lost nearly $100 billion last year, faces large debts left over from its earlier mergers. NPR's Jim Zarroli reports.

NPR's Joe Palca reports that NASA has sent teams to California and Arizona to expand its ground search for debris from the space shuttle Columbia. Large pieces, possibly one or more engines, have been located in Louisiana. The loss of Columbia is forcing NASA to reevaluate the future of the international space station. The space station is not in immediate danger, because a Russian supply vehicle docked with it yesterday.