I suppose this could be classified as recycling at its finest. NASA is recalling the retired Wide-field Infrared Survey Explorer back into service for a three year near-Earth asteroid search mission. Why is it that when NASA gets a sense of urgency I get a bad feeling about this? "The search took on a note of urgency after a small asteroid blasted through the skies above Chelyabinsk, Russia, in February 2013 and exploded with 20- to 30 times the force of the Hiroshima atomic bomb. More than 1,500 people were injured by flying glass and debris.