Russian President Vladimir Putin speaks in front of the map of the Russian Federation, with Crimea on the left of the map, during his annual news conference in Moscow, Russia, on Thursday. The Kremlin has responded angrily to the latest round of U.S.-EU sanctions over the annexation of Crimea. Alexei Druzhinin/AP hide caption

itoggle caption Alexei Druzhinin/AP

A banner for The Interview is posted outside Arclight Cinemas, in the Hollywood section of Los Angeles on Wednesday. The theatrical release of the film has been cancelled following cyber attacks and threats believed to originate in North Korea. Damian Dovarganes/AP hide caption

itoggle caption Damian Dovarganes/AP

The author, Dr. Gavin Francis, arrived at Halley base on Christmas Eve 2002, at the height of the Antarctic midsummer, when 24-hour sunlight illuminates the vast swathes of empty ice. Courtesy of Gavin Francis hide caption

itoggle caption Courtesy of Gavin Francis