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Russia_Mars_500.sff.jpg

Russian space officials watch video footage of researchers in space suits simulating a landing on Mars at the Mission Control Center in Korolyov, just outside Moscow, Monday, Feb. 14, 2011. The international crew of researchers conducted a mock landing on Mars after 257 days of confinement in an isolated module to imitate a flight to the Red Planet. (AP Photo/Sergey Ponomarev)

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Russia_Mission_to_Mars.sff.jpg

Russian space officials watch video footage of researchers in space suits simulating a landing on Mars at the Mission Control Center in Korolyov, just outside Moscow, Monday, Feb. 14, 2011. After 257 days in a locked steel capsule, researchers on a mock trip to Mars ventured from their cramped quarters Monday in heavy space suits, trudging into a sand-covered room to plant flags on a simulated Red Planet. The crew of three Russians, a Frenchman, an Italian-Colombian and a Chinese entered a network of modules at a Moscow research center last June to imitate the 520-day flight and see how they handle the constricted, isolating conditions of space travel _ minus the weightlessness. (AP Photo/Sergey Ponomarev)

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Valentine_Comet.sff.jpg

This photo released by NASA/JPL on Feb. 15, 2011 shows an image from NASA's Stardust mission of comet Tempel 1 taken on Feb. 14, 2011. The Stardust craft zipped past a comet half the size of Manhattan during a Valentine's Day rendezvous that scientists hoped would shed light on these icy solar system bodies. At nearest approach, the craft passed within 112 miles of the potato-shaped comet, closer than the original prediction. (AP Photo/ NASA/JPL/ Caltech/Cornell)

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APTOPIX_Chile_Earthquake.sff.jpg

A woman holds a child as they stand outside a building as a precaution after a magnitude-6.8 earthquake in Concepcion, Chile, Friday Feb. 11, 2011. The earthquake struck central Chile Friday, centered in almost exactly the same spot where last year's magnitude-8.8 quake spawned a tsunami and devastated coastal communities. Electricity and phone service were disrupted and thousands of people fled to higher ground following Friday's quake, but the government quickly announced that there was no risk of a tsunami, and there were no reports of damage or injuries. (AP Photo/Francisco Negroni)

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20110210-225557-pic-253678757.jpg

NOT GOING: Mr. Mubarak's decision to give power to the vice president was not enough for the thousands of demonstrators. (Associated Press)

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20110210-172446-pic-224725705.jpg

The structure of an electric car differs considerably from that of a conventional car — and the new components pose a number of new safety challenges.

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Nurse- Drug Theft_Lea.jpg

Sarah May Casareto, 33, of Forest Lake, Minn., has been charged with one felony count of theft of a controlled substance. (AP Photo/Hennepin County [Minn.] Sheriff’s Office)

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20110210-103013-pic-701036068.jpg

The condominium homes range in size from 1,465 to 1,703 square feet. Buyers can add an electric fireplace to the living room.

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20110210-103013-pic-105025747.jpg

Sturbridge Homes is building 250 condominiums at Central Parke at Victoria Falls in Laurel. The homes are priced from $187,500.

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20110210-103006-pic-560541906.jpg

Miller & Smith is building 45 town homes at Autumn Walk at Emerson in Laurel. The homes have 2,737 to 2,903 finished square feet, with base prices from $389,990 to $414,990.

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20110210-102950-pic-335505121.jpg

The center-island kitchen in the Sycamore model at Selma Estates has hardwood floors, granite counters, 42-inch cabinets and stainless steel appliances. The model is base-priced from $549,990 and has from 3,281 to 6,448 square feet.

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20110210-102950-pic-803320510.jpg

Stanley Martin Homes is building 244 single-family homes at Selma Estates in Leesburg. The homes have 2,662 to 3,281 finished square feet and can be expanded to 6,053 to 6,448 square feet.

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20110209-190549-pic-843635031.jpg

Clothes dry in the sun outside a shack in Juba. Even aid workers live in shipping containers, and 85 percent of the population is illiterate, but excitement over independence is widespread. (Associated Press)

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Wake Forest Kidney Tr_Star.jpg

In this provided by Wake Forest University, Wake Forest baseball coach Tom Walter, right, visits with player Kevin Jordan one day after donating a kidney to Jordan at Emory University Hospital in Atlanta on Tuesday, Feb. 8, 2011. Jordan was diagnosed last April with ANCA vasculitis, a type of autoimmune swelling disorder caused by abnormal antibodies. (AP Photo/Wake Forest University, Steve Shutt)

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Wake_Forest_Kidney_Transplant_Baseball.sff.jpg

In this provided by Wake Forest University, Wake Forest baseball coach Tom Walter, right, visits with player Kevin Jordan one day after donating a kidney to Jordan at Emory University Hospital in Atlanta on Tuesday, Feb. 8, 2011. Jordan was diagnosed last April with ANCA vasculitis, a type of autoimmune swelling disorder caused by abnormal antibodies. (AP Photo/Wake Forest University, Steve Shutt)

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20110207-204909-pic-920686327.jpg

Gregory L. Schulte, deputy assistant secretary of defense for space policy, said the International Space Station has had to maneuver around Chinese satellite debris. (Associated Press)

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20110207-173523-pic-195679136.jpg

Interior Secretary Ken Salazar (left) and Energy Secretary Steven Chu look over a map of areas under consideration for wind energy development. Leasing of sites could begin by the end of the year. They made the announcement Monday morning. (Associated Press)

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FIRE.jpg

Flames are seen after an explosion went off at a gas terminal in Egypt's northern Sinai Peninsula on Saturday, Feb. 5, 2011, in El-Arish, setting off a massive fire. No injuries were reported, and the blaze was quickly brought under control after the gas flow was shut off. (AP Photo/Ashraf Swailem)

APTOPIX Australia Sto_Thir.jpg

APTOPIX Australia Sto_Thir.jpg

Locals walk through a garden square in Mission Beach, Australia, Friday, Feb. 4, 2011, after Cyclone Yasi brought heavy rain and howling winds gusting to 186 mph. The cyclone destroyed dozens of homes, ripped roofs and walls from dozens more as well as cutting power supplies in two regional cities and laid waste to hundreds of millions of dollars worth of banana and sugar cane crops. (AP Photo/Rick Rycroft)

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An optimistic message is displayed on a destroyed home in Tully, Australia. Cyclone Yasi, the most powerful storm to hit the area in nearly a century, caused widespread damage but no deaths because residents heeded orders to evacuate. (Associated Press)