Computer, at that point, was a job title, not a machine. Long before the sisters were businesswomen, community activists, mothers or grandmothers, they were recruited by the U.S. military to do ballistics research. They worked six days a week, sometimes pulling double or triple shifts, along with dozens of other women.
The weapons trajectories they calculated were passed out to soldiers in the field and bombardiers in the air. Some of their colleagues went on to program the earliest of general-purpose computers, the ENIAC.
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