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A Clonaid official backpedals on providing evidence of the company's claim that a cloned infant has been born. Clonaid's CEO says the mother of the child born Dec. 26 is wavering on providing a DNA sample key to establishing genetic proof. Scientists remain skeptical of Clonaid's claim. Hear from NPR's Joe Palca and James Randi, who is devoted to debunking pseudoscientific claims.

For the first time in 30 years, streams and wetlands throughout the United States could lose Clean Water Act protections under a proposal expected this week from the Bush administration. NPR’s John Nielsen reports.

Researchers announce this week that orangutans have culture. The evidence: tree-riding games, leaves used as gloves, and sputtering "raspberry" sounds that may mean "good night." Until now, only two other species on the planet qualified as having socially-transmitted behavior: chimps and humans. NPR's Christopher Joyce reports.

In an arched portico off Mexico City's central plaza, street musician Carlos Garcia makes beautiful music with an unlikely instrument: a simple leaf.

A look at the controversial term of the departing director of the World Health Organization, Dr. Gro Harlem Brundtland. The former prime minister of Norway is credited with rehabilitating an organization whose reputation had been tarnished by charges of corruption and mismanagement. But in the more than five years since she took charge, the burden of disease and health conditions among the world's poor has gotten worse. NPR's Brenda Wilson reports on how Brundtland dealt with the challenges of her job.

The seven men arrested in Britain over the weekend were allegedly manufacturing Ricin, a poison made from the berries of a common ornamental plant. NPR's Ketzel Levine looks at the plant itself.

The science journalist who agreed to vet the claim that a cloned baby has been born is backing out. Michael Guillen says Clonaid has not given provided any access to the alleged clone. NPR's Joe Palca has the story.

Will Congress try again to ban human cloning? The debate is sure to escalate after Friday's claim that a newborn girl is the first human clone -- and more are on the way. There's no proof of the claim yet. And opponents and supporters of cloning are still battling over terminology. NPR's Julie Rovner reports.

In swamps and wetlands all over the South, fat, furry rodents called nutria -- a beaver-like animal native to Argentina -- are devouring small plants and sparking huge erosion problems. NPR's Melanie Peeples meets with some Louisiana trappers who earn $4 from the state government for each nutria they kill.

Ruth Gruber's career began in 1933 as a journalist, then as a member of the Roosevelt administration and then as a reporter covering post-war Europe and the development of Israel. NPR's Steve Inskeep talks with Gruber about her life and new book, Inside of Time.