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In 1946, one of the world’s first electronic computers was unveiled in Philadelphia, in the USA.

It was called the Electronic Numerical Integrator and Computer, or ENIAC, and was initially designed to do calculations for ballistics trajectories.

It was programmed by six female mathematicians.

Rachel Naylor speaks to Gini Mauchly Calcerano, whose dad John Mauchly co-designed it, and whose mum, Kay McNulty, was one of the programmers.

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(Photo: Computer operators programming the ENIAC. Credit: Corbis via Getty Images)