Millions of bats live in Bracken Cave, in a rural area near San Antonio. Conservationists are worried that plans for a multithousand-unit housing development will disrupt the bat colony. Eric Gay/AP hide caption

A Predator drone operated by the U.S. Customs and Border Protection Office of Air and Marine taxis for a flight over southern Arizona near the Mexican border on March 7 from Fort Huachuca in Sierra Vista, Ariz. John Moore/Getty Images hide caption

As Sochi, Russia, prepares to host the 2014 Olympic Games, workers walk past piles of dirt at the construction site of Fisht Stadium and Olympic Park on May 20. Artur Lebedev/ITAR-TASS/Landov hide caption

Sen. Susan Collins, R-Maine, is among the lawmakers who say they were never briefed about the government's surveillance programs. T.J. Kirkpatrick/Getty Images hide caption

Jasmine Chestnut at her internship at the Center for American Progress in Washington. An at-risk student, Chestnut had almost given up on college when a nonprofit network supported by the government's Social Innovation Fund helped her get back on track. Gabriella Demczuk/NPR hide caption

Plan B One-Step might be the only emergency contraceptive available to all ages without a prescription. ASSOCIATED PRESS hide caption

This young female rhinoceros, photographed in Kenya in 2011, was killed by ivory poachers a few months after this photo was taken. Courtesy of Tom Snitch hide caption