"Tony Sale's tribute to the wartime codebreakers is awe-inspiring and we are seeking resources to present the rebuilt Colossus so that generations to come will be able to understand its significance, " he said.
If you finish Singh's code book and want to tax your brain even more, go back to David Kahn's 1, 200-page The Codebreakers, a classic that came out in 1967 and was recently updated.