Researchers out of Purdue and Stanford University have found evidence that small temperature increases over the next two decades could have a surprisingly drastic impact on the volatility of corn prices. And federal biofuel mandates may make things worse.
On Thursday, NASA handed the world's most traveled space shuttle over to the Smithsonian. Visitors won't be able to walk its decks, but they will be able to experience the shuttle's interior through interactive images.
Polar bears were previously thought to have split from brown bears some 150,000 years ago. But a study of the bears' mitochondrial DNA indicates that they became a distinct species about 600,000 years ago.