Neil Johnson, a University of Miami physicist, developed this mathematical formula to predict insurgent attacks in war zones. Courtesy of Neil Johnson hide caption
Science
Sunday
Campers Mary Church and Jimmy Cong use their sense of smell to detect whether a chemical reaction has taken place. Amy Standen for NPR hide caption
Saturday
Friday
Last year, the Obama administration canceled plans to make Yucca Mountain the permanent storage site for the nation's nuclear waste. The half-built site is seen here in a file photo from 2006. Isaac Breekken/AP hide caption
Thursday
Human psychology is just one of the many factors House Speaker John Boehner must consider as he negotiates and lobbies for votes on Capitol Hill. J. Scott Applewhite/AP hide caption
Hard-won carbon going up in smoke: the 2007 Anaktuvuk River Fire, North Slope, Alaska. Source: Alaska Fire Service Alaska Fire Service hide caption
Above-ground casks at the Diablo Canyon nuclear power plant store some of the utility's nuclear fuel. Because of a lack of a central repository, nuclear waste is piling up at individual reactor sites across the United States. Michael Mariant/AP hide caption