The Manchester Baby, also known as the Small-Scale Experimental Machine (SSEM), was the world’s first electronic stored-program computer. Frederic Calland Williams, Tom Kilburn, and Geoff Tootill, ran its first program on 21 June 1948, seventy-one years ago.

The Manchester baby was made on the 21st June 1948. It had 1 kilo-bit of memory. On it, it took about an hour to find a factor of a number, but it was revolutionary.