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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

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At Resource Management's Materials Recovery Facility, workers pull plastic bags, other trash and large pieces of cardboard off the conveyor belts before the mixed, single-stream recyclables enter the sorting machines. Véronique LaCapra/St. Louis Public Radio hide caption

itoggle caption Véronique LaCapra/St. Louis Public Radio