A farmer harvests corn on a farm near Spring Mills, Pa. According to current biofuel laws, if you burn ethanol from corn in your car, the government doesn't count the carbon dioxide that comes out of the tailpipe as an actual carbon emission.
Gunnar Oquist (left), permanent secretary of the Royal Swedish Academy of Sciences, and Ingemar Lindstrom of the Academy sit next to portraits of the 2009 Nobel Physics Prize winners in Stockholm on Tuesday.
Scanpix Sweden/Bertil Ericson/AP
A glacier in Patagonia, Argentina, calves, with a sudden collapse of ice. Researchers say that the activity that precedes these types of tipping points and the triggers that cause them may follow predictable patterns.
Philip Stanley Dickson/iStockphoto.com
In the study, cotton-top tamarins grew calmer after they heard music compositions based on their own calm, friendly calls, and became more agitated when exposed to music that contained elements of their own threatening or fearful calls.
Bryce Richter/University of Wisconsin-Madison