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Economists call it the social cost of carbon. A single number that is supposed to reflect all of the costs society incurs when people burn fossil fuels. That number is now part of federal regulations, and some industries aren't happy.

Donald Trump proposed "extreme vetting" for potential immigrants, saying the U.S. should only accept newcomers who share the country's values and respect its people. NPR looks at how that would work.

The Roman Emperor Nero was said to enjoy snow topped with honey. Persians liked to drink sharbate over ice. But a scientific discovery in the 1500s paved the way for our modern ice creams.

Third of five episodes. The Planet Money oil faces a test, we sell it, and we meet the man who set off the fracking boom in America.

Victims of the July 11 attack are coming forward with details. They say the international community is not doing enough to hold South Sudan to account.

Early damage reports don't yet reveal the full extent of the damage caused by flooding in Louisiana, but at least 11 people have been killed and 30,000 evacuated. Some 40,000 homes have been damaged.

On the campaign trail, Republican presidential candidate Donald Trump frequently promises to bring manufacturing jobs back to the U.S. But how realistic is it to think he could do that, if elected?

Senate Republicans are bracing for down-ballot losses that are likely to cost the party their Senate majority this year.

Donald Trump named a conservative media provocateur to lead his campaign — in the third major shakeup during the election season. David Greene talks to senior Trump adviser Boris Epshteyn.

These middle schoolers built a 200-pound human brain on wheels. Will it survive the eight-hour race through the streets of Baltimore?