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The U.S. exports a billion pounds of used clothes every year. Much of that winds up in used clothing markets in sub-Saharan Africa.

The business that transformed the nation is the product of an obscure but hugely influential trade deal — and a cultural struggle over Korean food.

NPR's Robert Siegel talks to the usually silent half of Penn and Teller about his upcoming documentary, which follows an inventor trying to replicate the method he believes the Dutch master Johannes Vermeer employed to create his incredibly lifelike paintings.

Shoppers spent less this weekend than they did last year, even though many stores were open on Thanksgiving. Analysts are still predicting a strong holiday shopping season, but uncertainty about the economy is making customers uneasy.

Since the rollout of HealthCare.gov, many have wondered whether a private company could have avoided the federal site's many pitfalls. Oregon took that route, hiring Silicon Valley titan Oracle to create its state insurance exchange. But two months after its scheduled launch, the website is still not working.

The administration is pledging $100 million toward a project to stop HIV infections once and for all. There's growing optimism among scientists that it may be possible to get patients' immune systems to control HIV without drugs, or even to eliminate the virus from the cells of infected people someday.

More than 150 years ago, Polly Parker, a Seminole Indian, organized and led an escape from federal troops who were deporting Indians to the West. Parker traveled through hundreds of miles of wilderness to get back to tribal lands. The tribe is marking the event by following that dangerous journey.

Transportation officials are investigating what caused a Metro-North Railroad passenger train to derail along the Hudson River in New York on Sunday morning. The crash left four dead and injured dozens more.

At a restaurant in Indiana, three men added $10,000 to their bar bills. In other places, hundreds and thousands have been added to checks. In recent months, the anonymous benefactors have given away about $54,000. They say they're doing the Lord's work, "one tip at a time."

The U.S. aims to reduce carbon dioxide emissions by 80 percent by 2050. Wind and solar power can help. But folks doing the math say other pricey, controversial technologies — such as burying carbon gas underground, and expanding nuclear power — are also likely to be part of a low-carbon future.