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What's the secret to long-lasting milk? A complex system of refrigeration called the cold chain. But in some parts of developing countries, the chain doesn't exist, leaving a lot of milk to spoil.

With burbling videos and cascades of linen and plastic that seem to pour from the ceiling, Waterweavers shows how rivers, fibers and recycled bottles are all part of the culture of the country.

Efforts to replace air traffic control's aging radar-based system have been stuck in the Federal Aviation Administration's bureaucracy and lacked funding from Congress.

NPR's Scott Simon and NPR's Tom Goldman chat about tonight's boxing match between Floyd Mayweather and Manny Pacquiao; the Kentucky Derby; and the NBA match-up between the Clippers and Spurs.

The outcomes of many medical procedures and treatments done in hospitals nationwide aren't tracked or even measured, says a surgeon who thinks that's bad. Understanding outcomes, he says, saves lives.

The Federal Railroad Administration has instructed Amtrak to install new automatic control systems on its northbound trains near the area of this week's derailment and to assess risks at all curves.

Bob Schieffer, anchor of CBS' Face the Nation, retires Sunday after 46 years at the network. NPR TV Critic Eric Deggans says Schieffer is the last among a vanished breed of traditional news anchors.

The four families testify before a House committee and urge the U.S. to step up efforts. The renewed focus comes as Iran and world powers try to work out a nuclear deal ahead of a June 30 deadline.

Legend has it that a Chinese emperor first discovered tea more than 4,700 years ago. As the culture surrounding tea has changed through the centuries, so, too, have the tools we use to drink it.

France has one of the world's highest dropout rates, and the reforms are meant to make the middle school curriculum more interesting. But critics say the changes amount to a "dumbing down."