Students at Delhi University prepare for a demonstration in support of Binayak Sen, who faces life in prison. Courtesy of Diana Derby hide caption

Diana and Actaeon (1556-59): Italian painter Titian depicts Actaeon, a mortal hunter, who accidentally encounters Diana, goddess of the hunt, as she bathes. Click "Enlarge" to see the full painting. Minneapolis Institute of Arts hide caption

Libyan leader Moammar Gadhafi (left) embraces Italian Prime Mnister Silvio Berlusconi at the end of an equestrian show in Rome on Aug. 30. Andreas Solaro/AFP/Getty Images hide caption

Pakistani police officers surround the U.S. Consulate during rallies on Feb. 18 condemning Raymond Davis, a U.S. Embassy employee who shot dead two Pakistanis in Lahore in January. K.M.Chaudary/AP hide caption

A mobile phone shows a Skype application. Josep Lago/AFP/Getty Images hide caption

Adrian Hudson, who works for the Dee Fisheries Trust, is one of the volunteers who are hunting down the invasive American mink in Scotland. "I guess there probably are people who like mink, but I've never met one," he says. David Greene/NPR hide caption

A new study finds that radio waves from a cell phone can affect the metabolism of brain cells, though there is no evidence that the effect is harmful. Here, a pedestrian talks on her phone on a street in San Francisco. Justin Sullivan/Getty Images hide caption