Environment
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Wild hogs roam Vicksburg National Military Park, where they are causing damage around some monuments. Last year's record flooding of the Mississippi River sent the hogs and other animals to higher ground - and the hogs stayed.

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The Matilda's horned viper, discovered in southwestern Tanzania about two years ago, is the world's newest snake species. It's named for the daughter of one of its discoverers, the director of the Wildlife Conservation Society in Tanzania. (Associated Press)

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**FILE** Army Brig. Gen. Koos Liebenberg stands July 19, 2011, in front of a projected slide of soldier with a poached rhino during a presentation at Kruger National Park in South Africa to visiting press on border patrol and rhino poaching. (Associated Press)

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Members of the Alaska National Guard help dig out the fishing town of Cordova, Alaska, on Sunday, Jan. 8, 2012, after massive snowfalls that collapsed roofs, trapped some people in homes and triggered avalanches. (AP Photo/Alaska National Guard)

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This artist concept provided by NASA on Jan. 10, 2012, shows the Curiosity rover cruising toward Mars. The spacecraft will adjust its flight path several times as it heads for an August landing in a Martian crater. (Associated Press)

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**FILE** President Obama talks with Environmental Protection Agency Administrator Lisa Jackson on Jan. 10, 2012, at EPA headquarters. (Associated Press)

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President Obama holds hands with his daughters Malia (left) and Sasha as they leave Sea Life Park, a marine wildlife park, with family friends on Dec. 27 in Waimanalo, Hawaii. (Associated Press)

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Debris litters the scene of explosions in Jalalabad in Nangarhar province, east of Kabul, Afghanistan, on Tuesday, Jan. 10, 2012. (AP Photo/Rahmat Gul)

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A man stands on the porch roof of a house buried in snow Saturday in Cordova, Alaska. Massive snowfalls have collapsed roofs, triggered avalanches and even trapped some people in their homes. (Associated Press)

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A man stands on the porch roof of a house buried in snow in the fishing town of Cordova, Alaska, on Saturday, Jan. 7, 2012. (AP Photo/Alaska Division of Homeland Security and Emergency Management, Kim Weibl)

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The bungee cord tied to Erin Langworthy, 22, of Perth, Australia, snaps during her jump from the Victoria Falls Bridge over the Zambezi River in Victoria Falls, Zimbabwe, on Saturday, Dec. 31, 2011. (AP Photo/Australian Channel 9 via APTN)

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**FILE** A Chesapeake Energy natural gas well site operates near Burlington, Pa. Natural gas locked in dense rock deep beneath Pennsylvania, New York, West Virginia and Ohio requires a powerful drilling process called hydraulic fracturing, or “fracking,” to release it. (Associated Press)

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Workers move a section of well casing into place at a Chesapeake Energy natural gas well site near Burlington, Pa. Fracking uses water mixed with sand and chemicals to break underground rock and release large amounts of gas. (Associated Press)

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GEOEYE SATELLITE IMAGE VIA ASSOCIATED PRESS This Sept. 26, 2009 file satellite image shows a facility under construction inside a mountain located about 20 miles northeast of Qom, Iran. Iran has begun uranium enrichment at a new underground site that is well protected from possible foreign airstrikes, a leading hard-line newspaper reported Sunday.

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Wake Forest's C.J. Harris, right, shoots the game-winning shot over Virginia Tech's Erick Green, left, in the final seconds of Wake Forest's 58-55 win in Winston-Salem, N.C., Saturday, Jan. 7, 2012. (AP Photo/Chuck Burton)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney (center) is joined Jan. 6, 2012, at a campaign event in Conway, S.C., by South Carolina Gov. Nikki Haley (left) and wife Ann. (Associated Press)

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The new U.S. Embassy in Malta is being built several miles from the Mediterrean island nation's capital, Valletta. (State Department photo)

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In this Thursday, Dec. 22, 2011 photo, Mizuho Nakayama shops at a grocery shop near her house in Tokyo. Japan's nuclear crisis has turned Nakayama into one of a small but growing number of Internet-savvy activist moms. In the days and weeks following the March 11 tsunami, frustration over the sketchy information coming from the government about the Fukushima Dai-ichi nuclear plant drove many Japanese to Twitter and alternative media webcasts. (AP Photo/Malcolm J. Foster)

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Ryan Homes is building 106 single-family homes on quarter-acre to half-acre sites at Lake Linganore at Eaglehead in Frederick. The Avalon model, with 2,935 square feet, is priced from $419,990 to $455,990.

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"The situation on the ground now, in humanitarian terms, is grim. Because people fled town, they didn't take anything with them. They've been in the bush for up to a week. They haven't had food, they haven't had access to clean water, in a number of cases their people are wounded." - Lise Grande, U.N. deputy humanitarian coordinator for South Sudan.