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This photo provided by NASA shows chemical tracers that were released from five rockets launched from NASA's Wallops Island test flight facility in Atlantic, Va., on March 27, 2012. The tracers form white clouds that allowed scientists and the public to visualize upper level jet stream winds. (Associated Press/NASA)

This photo provided by NASA shows chemical tracers that were released from five rockets launched from NASA's Wallops Island test flight facility in Atlantic, Va., on March 27, 2012. The tracers form white clouds that allowed scientists and the public to visualize upper level jet stream winds. (Associated Press/NASA)

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