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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.

NPR's Melissa Block interviews University of Pittsburgh law professor David Harris about the unusual charges against the six police officers involved in Freddie Gray's arrest.

We got milk when we domesticated goats and sheep around 9,000 BC. At first, that milk was easier to digest when fermented. So yogurt, along with other Neolithic foods, helped fuel civilization.

Americans embraced yogurt only after manufacturers upped the sweet factor. Now new startups aim to wean us from the sugar habit. Think yogurt with a kick of jalapeño or a drizzle of olive oil.

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.

In the developing world, where many people lack bank accounts or credit cards, banks may hesitate to loan them money. But researchers say cellphones can help determine people's creditworthiness.

Water samples taken after the spill showed lead concentrations that were 3,500 times the levels normally seen in Durango, Colo.

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.

Corey Knowlton of Dallas won an auction last January for a hunting permit that would allow him to kill a black rhino weighing about 3,000 pounds.

Renaissance woman Hedy Lamarr was born on this day 100 years ago. Not only was she a major screen actress, she was also an inventor. NPR's Karen Grigsby Bates speaks with Lamarr biographer Richard Rhodes.