Environment

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Volunteers work on a Habitat for Humanity home. The community is marking the anniversary of a deadly tornado that killed 161 people as it cut a wide swath through Joplin a year ago. (AP Photo/Charlie Riedel)

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Marilyn Sixx hugs her son, Chris Sixx, during a ceremony marking the anniversary of a deadly tornado that devastated Joplin, Mo., a year ago. (AP Photo/Charlie Riedel)

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The Falcon 9 rocket cut a fiery arc through the darkness when it lifted off just before 4 a.m. Tuesday and boosted an unmanned capsule into orbit. Financed by a billionaire businessman, the ship will deliver supplies to the International Space Station. The launch marked the first time a commercial spacecraft has been sent to the outpost. (Associated Press)

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Duke goalie Dan Wigrizer has a .600 save percentage in two NCAA tournament games heading into Saturday's semifinal against Maryland. (Duke University)

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Customers line up to buy sugar at a market in Buenos Aires on Friday, May 18, 2012. (AP Photo/Natacha Pisarenko)

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For Jakaya Kikwete, the president of Tanzania, money to advance Africa's agriculture is essential for his and many other African nations. "If we can succeed, we will lift millions and millions of people out of poverty very quickly," he says. (Barbara L. Salisbury/The Washington Times)

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**FILE** The last light of the day sets on Mount Everest on Oct. 27, 2011, as it rises behind Mount Nuptse as seen from Tengboche, in the Himalaya's Khumbu region in Nepal. (Associated Press)

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Dutch astronaut Andre Kuipers (left) and American astronaut Donald Pettit, pictured on Friday, April 20, 2012, will use the International Space Station's robot arm to snare and berth the SpaceX Dragon supply capsule. (AP Photo/NASA and the European Space Agency)

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A partial annular solar eclipse is reflected in a pool of water in Beijing, China, Monday, May 21, 2012. Millions of Asians watched as a rare "ring of fire" eclipse crossed their skies early Monday. The annular eclipse, in which the moon passes in front of the sun leaving only a golden ring around its edges, was visible to wide areas across the continent. (AP Photo/Ng Han Guan)

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A partial annular solar eclipse is seen over Beijing, China, Monday, May 21, 2012. (AP Photo/Ng Han Guan)

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South Korean astronomy students use telescopes and special sunglasses to observe an annular solar eclipse in Seoul, South Korea. (AP Photo/Lee Jin-man)

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An annular solar eclipse is seen through special sunglasses in Seoul, South Korea. Millions of Asians watched as a rare "ring of fire" eclipse crossed their skies early Monday. The annular eclipse, in which the moon passes in front of the sun leaving only a golden ring around its edges, was visible to wide areas across the continent. (AP Photo/Lee Jin-man)