Kit Harrington plays Jon Snow, who researchers found is one of the most important characters in Game of Thrones. Helen Sloan/Courtesy of HBO hide caption

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Helen Sloan/Courtesy of HBO

How Math Determines The 'Game Of Thrones' Protagonist

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Alan Rusbridger said today that he will step down as editor in chief of the Guardian next summer. Rusbridger oversaw the U.K. newspaper's publication of Edward Snowden's leak of classified material. Alastair Grant/AP hide caption

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Alastair Grant/AP

Glenn Greenwald, left, and David Miranda after Miranda's arrival at Rio de Janeiro's International Airport on Aug. 19, 2013. Miranda had been detained for nine hours at London's Heathrow Airport. Authorities questioned him about Greenwald's reporting of the "NSA leaks." Ricardo Moraes /Reuters/Landov hide caption

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Ricardo Moraes /Reuters/Landov

Sen. Rand Paul, R-Ky., in front of the federal district court in Washington, where he filed his lawsuit against the Obama administration and the NSA. Charles Dharapak/AP hide caption

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Charles Dharapak/AP

Travelers at Pearson International Airport in Toronto earlier this month. At an unnamed airport, Canada's spy agency tested a program that allowed them to track those who took advantage of free Wi-Fi. Aaron Harris /Reuters/Landov hide caption

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Aaron Harris /Reuters/Landov