Dark Matters: Filmmaker Michael Madsen considers the functional and conceptual challenges of Onkalo, a permanent nuclear waste store in Finland — chiefly, how to prevent future civilizations from breaking in before the waste decays. International Film Circuit hide caption

itoggle caption International Film Circuit

With just 600 residents and no cities, Sark, located about 80 miles off the coast of England in the English Channel, is the first dark-sky island. Phllip Capper/Flickr hide caption

itoggle caption Phllip Capper/Flickr

A man has his photo taken by a companion at the top of the the so-called "Rocky Steps" in front of the Philadelphia Museum of Art during a blowing snowstorm Dec. 26. Philadelphia has been pounded by multiple heavy snowstorms this winter and has learned the terrible truth: Sometimes, weather hype is not hype at all. Jacqueline Larma/AP hide caption

itoggle caption Jacqueline Larma/AP

Windmills, like these standing near the ocean at Kahuku Wind Farm on Oahu, are at the center of Hawaii's efforts to cut its reliance on oil. Ben Markus/Hawaii Public Radio hide caption

itoggle caption Ben Markus/Hawaii Public Radio

The Indiana Sawing Machine from the 1895 Montgomery Ward & Co. catalogue. Skyhorse Publishing hide caption

itoggle caption Skyhorse Publishing

President Obama's joke notwithstanding, a Commerce Department agency has the prime responsibility to protect salmon when they're in the ocean and when they swim upriver to spawn. Gary Stewart/AP hide caption

itoggle caption Gary Stewart/AP

During the 1980s, wildlife managers said striped bass like this one were overfished. Now, it appears that a weather pattern known as the Atlantic Multidecadal Oscillation may have been a contributing factor to the declines. Jay Fleming/Jay Fleming Photography hide caption

itoggle caption Jay Fleming/Jay Fleming Photography

Farmer Tim Winn, who has a farm on the banks of the Willamette River, says government scientists have concluded that there is nothing dangerous about the "Roundup Ready" version of the sugar beet crop. Dan Charles for NPR hide caption

itoggle caption Dan Charles for NPR

Ruins of the Villa of the Quintilii on the outskirts of Rome. Gregorio Borgia/AP hide caption

itoggle caption Gregorio Borgia/AP

A coal-fired power plant near Weisswasser, Germany. Sean Gallup/Getty Images hide caption

itoggle caption Sean Gallup/Getty Images