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

itoggle caption U.S. Fish and Wildlife Service

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

itoggle caption TEPCO

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

itoggle caption Bill Bouton/Flickr

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

itoggle caption Richard Harris/NPR

Oobleck has some novel physical properties. When it's moved slowly, it acts smooth and runny, like a liquid. But move it quickly and forcefully, and it locks up, becoming almost solid. Jonathan Makiri/NPR hide caption

itoggle caption Jonathan Makiri/NPR

The ice surface of Antarctica, looking toward the Gamburtsev Mountains and Dome A. Deep below the surface here, new ice is forming around the mountains and pushing upward. The black flags in the distance mark the edge of the runway for research aircraft studying the area. Robin E. Bell/Lamont-Doherty Earth Observatory hide caption

itoggle caption Robin E. Bell/Lamont-Doherty Earth Observatory