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Host Scott Simon reflects on the problems with political polling.

Recent research shows black carbon in soot may contribute to global warming by absorbing sunlight. Diesel engines are one source of soot. But wood fires in less developed countries -- including China -- are also a problem. NPR's Christopher Joyce reports.

NPR's Margot Adler tells the story of a woman she knew as a child who now has a New York City water taxi named after her.

Colin Powell was hailed as a hero for a swift and speedy U.S. victory in the Gulf in 1991. But his reputation suffered from his flawed presentation in advance of the second Iraq war 12 years later.

Wall Street cheers the resignation of SEC chief Harvey Pitt. Pitt's departure -- and the resignation of the agency's chief accountant -- could imperil the appointment of ex-FBI and CIA director William Webster to head an accounting oversight board. Hear more from NPR's Scott Simon and Joe Nocera, executive editor of Fortune magazine.

Host Scott Simon talks with Greg Herro, chief executive officer of LifeGem, a company that creates diamonds out of the carbon from the cremated remains of loved ones.

Yellowstone National Park awaits its annual influx of snowmobilers. The Clinton administration tried to ban them. The Bush administration proposes limits that have the potential to increase use of the machines throughout the park. NPR's Howard Berkes reports.

People from all points of the globe delight in the crusty bread baked by Lionel Poilane, who died in a helicopter crash this week. Poilane's daughters will keep the business -- and their father's memory -- alive. NPR's Scott Simon and Alice Furlaud remember the master baker.

Ariel Corporan sold crack and spent time at Riker's prison and has since turned his life around. In this autobiographical documentary produced by Sound Portraits as part of its Youth Portraits series, he tells his story for Weekend Edition Saturday.

NPR's Scott Simon speaks with Jenna Goldstein, co-president of Greenwich High School's Power Nap Club, about why their stressful schedules have driven them to hone their sleeping skills at school.