[GH85Carrera]

The last four images: In 1946, one of the world’s first electronic computers was unveiled in Philadelphia, in the US.
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. But it wasn't going to be easy.
"There were no manuals in those days. They had not yet been written," says Kay McNulty, one of the programmers.
To make things even harder, the work was top secret - and the programmers initially weren't even allowed to see the machine.