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Actor Mark Rylance, seen here as Thomas Cromwell in Masterpiece's Wolf Hall, views Cromwell as a survivor who knows how to manipulate power to his advantage. "He has the mind of a chess player," Rylance says. Giles Keyte/Playground & Company Pictures for Masterpiece/BBC hide caption

itoggle caption Giles Keyte/Playground & Company Pictures for Masterpiece/BBC

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About twice a year, statistics suggest, a pilot somewhere in the world — usually flying alone — deliberately crashes a plane. The Germanwing flight downed last week may be one such case. But most people who fit the psychological profile of the pilots in these very rare events never have problems while flying. Patrik Stollarz/AFP/Getty Images hide caption

itoggle caption Patrik Stollarz/AFP/Getty Images