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Each year the U.S. spends billions of dollars on unnecessary tests and treatments that result from inaccurate mammograms, some scientists say. They're calling for more selective screening.

Speaking forcefully about the need for gun policy reform Thursday, Obama said: "Our thoughts and prayers are not enough."

More than half the young people in a recent study were at least mildly dehydrated — maybe enough to affect energy and concentration. Roughly 25 percent said they never drink water.

One critter traveled around the globe from Australia on a eucalyptus tree. The other hitched a ride on a Central American flower. These flies are the tip of the invasive insect iceberg in California.

A senior executive personally said sorry to James Murphy, 94, who was forced to work in one of the company's copper mines, something Murphy described as "slavery in every way."

Arguably the dominating narrative of the U.S. Open was 27-year-old golfer Jason Day's ongoing struggle with benign positional vertigo.

An energy company is heading to court for the right to drill in Montana, near Glacier National Park. But some Native Americans and environmental groups want to stop the long-delayed project.

Economist Nuria Chinchilla is trying to change Spain's sleep schedule. She tells NPR's Scott Simon about her efforts to get the government to align the workday with the rest of the world.

Fuel economy is at record highs and carmakers have surpassed strict greenhouse gas emissions standards for the third straight year, the Environmental Protection Agency says.

The company says its Prime Air service will someday deliver packages up to five pounds in 30 minutes or less using small drones.