During World War II, the U.S. military studied bullet holes on returning planes to decide where to add armor. Most damage appeared on the fuselage, so many thought it should be reinforced.
— Math Files (@Math_files) January 9, 2026
Mathematician Abraham Wald pointed out a crucial flaw: the data only showed surviving… pic.twitter.com/mL0TMuqNAL
During World War II, the U.S. military studied bullet holes on returning planes to decide where to add armor. Most damage appeared on the fuselage, so many thought it should be reinforced.
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