Lawn mower to the ferns of Africa, the 500-toothed Nigersaurus was unlike any other. A reconstruction goes on display today at National Geographic in Washington.
Stem cells from cloned monkey embryos cause cautious optimism in scientists who say the advance may eventually lead to better human medical treatments.
Rocky planets are forming—and occasionally colliding—around a nearby star, scientists say. The find suggests that Earthlike planets may be far more common than previously believed.
One of the brightest—and most puzzling—star deaths known was caused either by a pair of giant colliding stars or a repeatedly exploding sun, scientists say.
More than 30,000 birds were killed by last weekend's Black Sea oil spill. Meanwhile California environmentalists are cleaning birds by hand after spilled oil there.
