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In this undated photo made available by journal Nature on Jan. 15, 2015, a northern bald ibis (Geronticus eremita) flies in Tuscany, Italy. A new study released Wednesday, Jan. 15, 2014 says the birds choreograph the flapping of their wings, getting a boost from an updraft of air in the wake of the flapping wings by flying behind the first bird and off to the side. When a flock of birds take advantage of these aerodynamics, they form a V. (AP Photo/Markus Unsöld)
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In this undated photo made available by journal Nature on Jan. 15, 2015, northern bald ibises (Geronticus eremita) fly in formation next to a microlight aircraft. A new study released Wednesday, Jan. 15, 2014 says the birds choreograph the flapping of their wings, getting a boost from an updraft of air in the wake of the flapping wings by flying behind the first bird and off to the side. When a flock of birds take advantage of these aerodynamics, they form a V. (AP Photo/Markus Unsöld)
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In this undated photo made available by journal Nature on Jan. 15, 2015, northern bald ibises (Geronticus eremita) fly in formation. A new study released Wednesday, Jan. 15, 2014 says the birds choreograph the flapping of their wings, getting a boost from an updraft of air in the wake of the flapping wings by flying behind the first bird and off to the side. When a flock of birds take advantage of these aerodynamics, they form a V. (AP Photo/Markus Unsöld)
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FILE - In this Monday, Jan. 13, 2014, file photo, workers inspect an area outside a retaining wall around storage tanks where a chemical leaked into the Elk River at Freedom Industries storage facility in Charleston, W.Va. Department of Environmental Protection spokesman Tom Aluise says inspectors found five violations Monday at a Nitro, W.Va., site where Freedom Industries moved its coal-cleaning chemicals after last Thursday's spill. Inspectors found that, like the Charleston facility where the leak originated, the Nitro site lacked appropriate secondary containment. In Charleston, a porous containment wall allowed the chemical to ooze into the Elk River. (AP Photo/Steve Helber, File)
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FILE - In this Monday, Jan. 13, 2014, file photo, workers,left, inspect an area outside a retaining wall around storage tanks where a chemical leaked into the Elk River at Freedom Industries storage facility in Charleston, W.Va. Department of Environmental Protection spokesman Tom Aluise says inspectors found five violations Monday at a Nitro, W.Va., site where Freedom Industries moved its coal-cleaning chemicals after last Thursday's spill. Inspectors found that, like the Charleston facility where the leak originated, the Nitro site lacked appropriate secondary containment. In Charleston, a porous containment wall allowed the chemical to ooze into the Elk River. (AP Photo/Steve Helber, File)
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In this undated photo made available by journal Nature on Jan. 15, 2015, northern bald ibises (Geronticus eremita) fly in formation. A new study released Wednesday, Jan. 15, 2014 says the birds choreograph the flapping of their wings, getting a boost from an updraft of air in the wake of the flapping wings by flying behind the first bird and off to the side. When a flock of birds take advantage of these aerodynamics, they form a V. (AP Photo/Markus Unsöld)
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FILE - In this June 18, 2010, file photo, U.S. Senator Michael Bennet, D-Colo., center, helps as Solar City employees Jarret Esposito, left, and Jake Torwatzky, right, install a solar panel on a home in south Denver. The solar panel installer SolarCity said Wednesday, Jan. 15, 2014, it will launch an investment platform that will allow individuals and others to invest in rooftop solar systems directly with SolarCity. (AP Photo/Ed Andrieski, File)
