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Residents survey the destruction after a tornado hit Pratt City, Ala., on April 27. Short-term forecasting of twisters like the ones that swept the South this week has grown increasingly accurate, but long-term forecasting remains highly unreliable.
Butch Dill/AP
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President John F. Kennedy gets a lesson on the Saturn launch system from Wernher von Braun (center), a German rocket scientist who championed America's space exploration program, during a visit to Cape Canaveral on Nov. 16, 1963.
NASA
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The Alpha Magnetic Spectrometer is loaded into the vehicle that would take it to the space shuttle launchpad on March 15. The $2 billion cosmic ray detector will be carried to the International Space Station on Endeavour's final flight.
NASA
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The brown marmorated stink bug has inundated the mid-Atlantic, taking its toll on crops across the region. Researchers are investigating whether a type of parasitic wasp can bring down stink bug numbers.
Jeff Wildonger/USDA Beneficial Insect Research Lab
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Jeff Wildonger/USDA Beneficial Insect Research Lab