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 hide caption
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 hide caption
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 hide caption
The armadillo is the only animal, besides humans, that is known to carry leprosy-causing bacteria. Richard Anderson/Flickr hide caption
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 hide caption