Someone else asked a similar question – but I’ll give a different answer this time.
Alan Turing. The atmosphere at Bletchly park when Alan and his team were inventing machines to solve the German codes in the second world war would have been incredible. The emotional highs and lows, and the intense thinking going on would beat anything I’ve been through. I doubt I could have followed half of what was going on, but what a ride it would have been.