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The Koch brothers' political network of wealthy donors this weekend auditioned five GOP presidential candidates, another sign of billionaires' increasing political clout.

It's called yaupon. Native Americans once made a brew from its caffeinated leaves and traded them widely. With several companies now selling yaupon, it may be poised for a comeback.

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

NPR's Melissa Block speaks to Roger Zalneraitis, executive director of the La Plata County Economic Development Alliance, on plans to aid small business owners after the toxic waste spill.

In developing countries, folks may trek hours to fetch water — or turn on the spigot and wait endlessly for drops to flow. A new app offers a promising solution for the latter problem.

River traffic was halted on a portion of the waterway after the accident near Paducah, Ky. The maximum size of the Wednesday evening spill of clarified slurry oil is thought to be 250,000 gallons.

Two tow boats hit each other near Columbus, Ky., on Wednesday. One of them released an unknown quantity of potentially toxic clarified slurry oil.

Stock prices may be having a meltdown, but consumers and homebuyers are still pushing the economy forward. In fact, a new round of data suggests the economy is gaining strength even as markets fall.

The reign of the Humvee is coming to an end and a new fleet of military vehicles is on the way. Washington Post reporter Christian Davenport discusses the history of the Humvee and what's next.

Hampton Creek CEO Josh Tetrick's signature product, Just Mayo, has put him at odds with the egg industry and FDA.