During World War II, the United States created a classified program called The Statistical Research Group (SRG). Its purpose was to help the US army solve problems using equations and formulae. In other words, SRG was into wartime math.
One interesting problem military gave SRG was about making sense of bullet holes in American planes. When those fighter planes came back from the battle, they were usually covered with bullet holes inflicted by the enemy guns. The military wanted to figure out the most optimum way to put the armor on the plane.
Well, couldn’t they armor the whole plane?
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