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Reporting in Science, researchers write that mouse stem cells can be transformed not only into egg cells--but into newborn pups. Sean Morrison, a stem cell expert at the University of Texas Southwestern, explains the stem cell's journey, and what it could mean for fertility and assisted reproduction.

The organization also apologized to Canada for the "egregious" actions of one of its athletes.

Law enforcement officials said there's a possibility the agents fired at each other thinking others were firing on them.

The FBI says there are strong preliminary indications that the killing of a Border Patrol agent earlier this week was accidental. Melissa Block talks with NPR's Ted Robbins about the ongoing investigation of the shooting along the Arizona-Mexico border.

All the news we couldn't fit anywhere else.

During the financial crisis, gold prices hit record highs as people looked for somewhere safe to park their money. In West Africa, that's had a devastating, deadly effect on children.

President Hugo Chavez has never faced a serious threat in a presidential election until now. A young former governor has been electrifying crowds and putting Chavez's 14 years of power — and his socialist experiment — at risk.

Friday, the MLB debuted its new playoff format: Two wild-card teams from each league played in a high-stakes, single-shot game to advance to the full playoffs. The Baltimore Orioles defeated the Texas Rangers, and the St. Louis Cardinals beat the Atlanta Braves. NPR's Tom Goldman speaks with host Scott Simon about those games and the Rockets' Royce White, who plays in the NBA with a generalized anxiety disorder.

Mikhail Sebastian is stateless. Born ethnically Armenian in what was then the U.S.S.R. and today is Azerbaijan, he came to the U.S. and was eventually allowed to stay and work. Now, he is stranded on American Samoa where immigration officials say he "self-deported."

Venezuelans go to the polls to decide their next president. Hugo Chavez is facing his stiffest competition in 14 years of rule. NPR's Juan Forero has the latest on the election.