Abraham Wald was a mathematician during World War II. His job was to review damaged planes coming back from bombing runs or dogfights in German airspace. He was asked to evaluate which parts of the planes should get additional armor plating.
He noticed that the fuselage and fuel systems from planes that returned were far more likely to be damaged by bullets or flak than the engines. You might be tempted to conclude that the fuselage and fuel systems should be reinforced with additional armor plates.
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You can read more about Abraham here: http://en.wikipedia.org/wiki/Abraham_Wald