BLETCHLEY PARK, BUCKINGHAMSHIRE, ENGLAND, UK - A Colossus Mark 2 code-breaking computer being operated by the Wrens Dorothy Du Boisson (left) and Elsie Booker (right) during the summer of 1943 at Bletchley Park in Buckinghamshire, England, UK. Aside from famously cracking the German Enigma codes, machines like Colossus developed by Alan Turing paved the way for the modern computers of today - Photo: Geopix

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