November 23, 2012 Scientists who study forests say they've discovered something disturbing about the way prolonged drought affects trees. When drought dries out the soil, a tree has to suck harder to draw in water. But that increases the risk of drawing in dangerous and deadly air bubbles.
November 14, 2012 California starts the ball rolling Wednesday on a controversial scheme to keep the planet from overheating: Businesses will have to get a permit if they emit greenhouse gases. And one California company is hoping to get in on the ground level, by turning trash into biomass energy.
November 2, 2012 An army of electrical workers is squirming through the tunnels beneath New York City, checking transformers, cables and power systems. And though it'll likely take days to get everything back online, experts say the storm would have damaged aboveground infrastructure even more drastically.
October 26, 2012 The ornithomimus dinosaur was built like a 400-pound ostrich and lived about 75 million years ago. But recent research suggests the adult dinos had big, showy, colorful feathers with quills that were most likely used for sexual displays or courtship.
October 24, 2012 Because we had better food, our brains grew bigger than those of our primate cousins, scientists say. Early humans cooked, which makes meat and veggies more digestible and nutrients more available to the body. Plus, there was all that chatting and chewing around the campfire.
October 23, 2012 Whales are among the great communicators of the animal world. They produce all sorts of sounds: squeaks, whistles and even epic arias worthy of an opera house. But in the mid-1980s, one beluga whale did something that had never been documented before: It imitated human speech.
October 12, 2012 A meteorite from Mars hit the Moroccan desert in 2011. Now its otherworldly fragments are telling scientists about the history of the red planet. You, too, can own a piece of Martian history — if you've got a couple hundred thousand dollars to spare.
September 17, 2012 Some of the biggest human migrations coincided with major changes in climate, according to a new analysis. Researchers say early humans set out in search of climates where more food was available. And some populations stayed put in certain locations because barriers like glaciers blocked their progress.