Streets flooded in the Staten Island borough of New York after Superstorm Sandy hit in October. The storm caused multiple fatalities, halted mass transit and cut power to more than 6 million homes and businesses. John Minchillo/AP hide caption

itoggle caption John Minchillo/AP

Grace Aber stands in the shade of a mango tree with her children in the remote village of Tumangu in northern Uganda. Four of Aber's nine children have been diagnosed with nodding syndrome, starting with Partick (front), who first showed symptoms in 2002. Matthew Kielty for NPR hide caption

itoggle caption Matthew Kielty for NPR

A file photo from 2011 shows a man touching a giant bronze sculpture of a mammoth in the Siberian city of Khanty-Mansiysk. A team of Russian and South Korean scientists who found a well-preserved frozen woolly mammoth carcass this month say it also included blood. Natalia Kolesnikova/AFP/Getty Images hide caption

itoggle caption Natalia Kolesnikova/AFP/Getty Images

Radar images of asteroid 1998 QE2, taken when the cosmic traveler was about 3.75 million miles from Earth, revealed that the asteroid, with a 1.7-mile diameter, has a moon or satellite revolving around it. NASA/JPL-Caltech/GSSR hide caption

itoggle caption NASA/JPL-Caltech/GSSR

Channel-billed toucans are important seed dispersers in rain forests. Courtesy of Lindolfo Souto/AAAS/Science hide caption

itoggle caption Courtesy of Lindolfo Souto/AAAS/Science

Whenever a steer or cow leaves a farm in Michigan or goes to a slaughterhouse, it passes by a tag reader, and its ID number goes to a central computer that keeps track of every animal's location. Dan Charles/NPR hide caption

itoggle caption Dan Charles/NPR