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Optimists outperform pessimists on the job by as much as 50 percent. Which do you choose to be? When you wake up every day you have two choices

If you find yourself opting for a slice of cake over a piece of fruit for dessert, even though you know it's loaded with calories, it may not be your fault. A combination of bad news about the economy and your survival instincts may be to blame, according to a new study.

Why was Japan's March 11 earthquake so big? One answer is the large size of the fault rupture as well as the speed at which the Pacific Plate is continuously thrusting beneath Japan, U.S. Geological Survey (U.S.G.S.) scientist Tom Brocher told KQED News.