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Frances Blias and Elizabeth Jennings with ENIAC. Women performed many of the mathematical calculations and developed the programming techniques. Although they didn't get credit at the time, their role has recently become better acknowledged.

"The audience was absolutely astounded. ENIAC ran the trajectory faster than it took the bullet to trace it. People got, as a souvenir, a printout of the trajectory we ran," said Jean Bartik, one of the surviving programmers, about the first demonstration of ENIAC to the military and other scientists.

Courtesy of the Computer History Museum.