You've probably seen a movie about this. Here's what the movie left out: the Polish mathematicians who broke Enigma first, the Americans who showed up with a codebreaking machine of their own, and the wartime intelligence-sharing agreement that quietly became the alliance the modern world still runs on.
Seven things that surprised me most, plus a bonus chapter on the computer nobody credits as the first one — because it stayed classified for thirty years.
Available on Amazon: https://www.amazon.com/dp/B0HDMLR471
