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When George Zimmerman saw Trayvon Martin walking down the street in Sanford, Florida, he quickly assumed that the Black, hoodie-clad teenager was carrying a weapon. He then pulled out his gun and fatally shot the young student, whose hands were gripping nothing more than a bag of Skittles. [More]

In the United States, 2011 was a year when weather seemed to ping-pong between extremes. [More]

Charles R.

Charles R. Knight (1874 – 1953) is best known for his arresting paintings of dinosaurs and other long-vanished beasts

Water, water, everywhere. But will we always have enough to drink? Wash away our waste?

Water, water, everywhere.

Dressings for your dish. | Photo by Michael Rosenstein, CC. Click on image for license and information.

Dressings for your dish. | Photo by Michael Rosenstein, CC.

You may not know his name, but chances are that you have seen his work. Brooklyn-born artist Charles R.

You may not know his name, but chances are that you have seen his work.

A rhino poached for its horn in Zimbabwe. Credit: Anti-poaching Unit, Zimbabwe Reeking of infection, the elephant stumbled into the Tanzanian camp where Thomas Appleby works as a safari manager. Its back legs festered with gangrene radiating from the open, pungent wounds that the animal had evidently endured for at least two long weeks

A rhino poached for its horn in Zimbabwe. Credit: Anti-poaching Unit, Zimbabwe Reeking of infection, the elephant stumbled into the Tanzanian camp where Thomas Appleby works as a safari manager. Its back legs festered with gangrene radiating from the open, pungent wounds that the animal had evidently endured for at least two long weeks

A heartbreaking, out-of-the-gate failure of Russia’s sample return mission early this year created a wide circle of disappointment. For Russia, it was supposed to be a "cavalry charge" toward a hyperambitious goal that would have redeemed a quarter-century of interplanetary impotence but instead became a cosmic humiliation when the craft died shortly after liftoff. For planetary science, it meant that the composition of the Martian moon Phobos remains speculative and its origins still undetermined

A heartbreaking, out-of-the-gate failure of Russia’s sample return mission early this year created a wide circle of disappointment. For Russia, it was supposed to be a "cavalry charge" toward a hyperambitious goal that would have redeemed a quarter-century of interplanetary impotence but instead became a cosmic humiliation when the craft died shortly after liftoff. For planetary science, it meant that the composition of the Martian moon Phobos remains speculative and its origins still undetermined

TOKYO (Reuters) - Tokyo Electric Power Co, the operator of the tsunami-crippled Fukushima power plant, shut its last operating nuclear reactor on Monday for regular maintenance, leaving just one running reactor supplying Japan's creaking power sector. Japan has 54 reactors, but since the tsunami last March triggered the world's worst nuclear crisis in 25 years at the Fukushima plant, it has been unable to restart any reactors that have undergone maintenance due to public safety concerns. Tepco said it shutdown the No.6 reactor at its Kashiwazaki Kariwa plant, the world's biggest nuclear power plant, raising concerns about a power crunch this summer when electricity demand peaks due to hot weather.