Sean Joyce, right, deputy director of the Federal Bureau of Investigation testifies before the House Select Intelligence Committee on Tuesday. Win McNamee/Getty Images hide caption

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President Obama glances at Britain's Prime Minister David Cameron (right) during a news conference with European Union officials at the G-8 summit in Enniskillen, Northern Ireland, on Monday. WPA Pool/Getty Images hide caption

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Edward Snowden, seen during a video interview with The Guardian. Glenn Greenwald/Laura Poitras/EPA/Landov hide caption

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U.S. Army Gen. Keith Alexander, commander of the U.S. Cyber Command, director of the National Security Agency (NSA), testifies during a Senate Appropriations Committee hearing on Capitol Hill, on Wednesday. Mark Wilson/Getty Images hide caption

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In a 12-minute video on The Guardian's website, Edward Snowden talks about how American surveillance systems work and why he decided to reveal that information to the public. The Guardian hide caption

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Edward Snowden's revelations about National Security Agency have been front page news around the world, including in Hong Kong — where he was last seen. Bobby Yip /Reuters /Landov hide caption

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Former world chess champion Bobby Fischer in March 2005 as he left Japan for Iceland, where he lived out his final years. Yuriko Nakao /Reuters /Landov hide caption

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