Shoppers crowd a narrow street outside Tsukiji market in Tokyo on Dec. 31, 2010. Japan has relatively tight social rules. And that makes sense, according to researchers. When people are squeezed together, they have an incentive to cooperate. Toru Yamanaka/AFP/Getty Images hide caption

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Toru Yamanaka/AFP/Getty Images

Of War And Kisses: How Adversity Shapes Culture

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A worker checks the status of the water level at the Unit 1 reactor at the Fukushima Dai-ichi nuclear power plant in Japan on Tuesday. Japanese officials said the reactor doesn't appear to be holding water, which means its core probably sustained more damage than originally thought. TEPCO/AP hide caption

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TEPCO/AP

So Far, Nuclear Agency Confident In U.S. Reactors

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Two cells — one marked mostly in green, the other in blue — of a newly discovered organism found in water samples collected from the University of Exeter pond. Scientists think these "cryptomycota" use their tails to propel themselves while searching for food. Meredith Jones/Nature hide caption

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Meredith Jones/Nature

A New, Somewhat Moldy Branch On The Tree Of Life

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A Chinese farmer sweeps up dried cobs and stripped corn on a roadside outside Beijing. A new study finds that global production of corn and wheat would have been 5 percent higher if not for global warming. Alexander F. Yuan/AP hide caption

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Alexander F. Yuan/AP

World's Farmers Feel The Effects Of A Hotter Planet

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Alligator River National Wildlife Refuge is a low-lying area made of 154,000 acres of marshland and forest on the eastern shore of North Carolina. Much of the land is susceptible to sea level rise, so conservation managers are taking steps to help slow the inevitable. U.S. Fish and Wildlife Service hide caption

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U.S. Fish and Wildlife Service

A Struggle To Fight Back The Sea

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Workers at the Fukushima Dai-ichi nuclear power plant spray a substance to help reduce dust on April 1. The cleanup operation at the facility could take more than a decade. TEPCO hide caption

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TEPCO

Cleaning Up Fukushima: A Challenge To The Core

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Workers At Japan Plant Pump Radioactive Water Into Ocean

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Nighthawks are known for their repeated "peent" call as they hunt for flying insects. Bill Bouton/Flickr hide caption

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Bill Bouton/Flickr

Scientists Tune In To The 'Voices Of The Landscape'

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Keiji Nagashima has been farming spinach in Ibaraki prefecture for 25 years but will be destroying this year's crop because of fears of radiation exposure. "I can't have a life without the spinach," he says. Richard Harris/NPR hide caption

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Richard Harris/NPR

Crisis Forces Japanese Farmers To Destroy Crops

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Japan's Leaked Radiation May Soon Become Harmless

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Reactor Engineers Struggle To Maintain Progress

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Workers Struggle To Cool Fuel Rods In Japan Plant

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Radiation Spews From Crippled Nuclear Power Plant

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