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Cybil Preston, chief apiary inspector for the Maryland Department of Agriculture, does a training run with Mack: She sets up fake beehives and commands him to "find." He sniffs each of them to check for American foulbrood. He has been trained to sit to notify Preston if he detects the disease.
Solar Impulse 2 pilots Bertrand Piccard (right) and Andre Borschberg celebrate after Piccard landed their solar-powered plane at Moffett Field in Mountain View, Calif., on Saturday.
The World Resources Institute says you don't have to bid burgers bye-bye in order to reduce the environmental footprint of what you eat. For Americans, cutting back on beef (but not eliminating it altogether) could go a long way, it says.
Phan Sopheak, a rice farmer in Cambodia, rests shortly after a man wielding an axe attacked her. She had been patrolling the Prey Lang forest around her village with a volunteer group that is trying to stop illegal logging.
Courtesy of Prey Lang Community Network
Secretary of State John Kerry holds his 2-year-old granddaughter, Isabel Dobbs-Higginson, as he signs a far-reaching climate accord at the United Nations, in a ceremony timed to coincide with Earth Day on Friday.
Spencer Platt/Getty Images
The Solar Impulse 2 airplane, piloted by Bertrand Piccard, gains altitude after taking off from Kalaeloa Airport in Kapolei, Hawaii during a test and training flight in April.
Eugene Tanner /AFP/Getty Images
Former FBI Director Robert Mueller, right, arrives for a court hearing in San Francisco Thursday. Mueller has been overseeing talks about a settlement between Volkswagen, the U.S. government, and the car company's customers.