New federal numbers show that amid falling gas prices, Americans drove a record 3.15 trillion vehicle miles last year. This also means more pollution and traffic gridlock.
Left-leaning economists and Democratic analysts are sparring over Sanders' proposal of health care for all, paid for by the government. Some who like his aspiration say the numbers don't add up.
Gulf states are starting to spend the first of billions from BP's settlements and fines for the worst environmental disaster in U.S. history — but not all the money is being used for restoration.
Fewer people are having strokes now than decades ago. But that improvement seems to be mostly among the elderly. Young people are actually having more strokes, partly because of the rise in obesity.
Scientists say the buzz picked up by hydrophones in the Pacific may be caused by "fish farts" — the emptying of air bladders that let clouds of fish rise and fall during daily hunts for food.
It sounds like the plot for a terrible horror movie, but the plan to build a rattlesnake colony on an abandoned island in the Quabbin Reservoir in central Massachusetts is real. NPR's Audie Cornish talks to Tom French of the state Division of Fisheries and Wildlife.
A decade after phasing out celestial navigation from its academy courses, the U.S. Navy has restarted that formal training. The shift comes at a time of growing anxiety over possible threats to GPS.