Esther Eden

Alan Turing: [voiceover] There were 159 million, million, million possible Enigma settings. All we had to do was try each one. But if we had ten men checking one setting a minute for 24 hours every day and seven days every week, how many days do you think it would take to check each of the settings? Well it's not days, it's years. It's 20 *million* years. To stop a coming attack, we would have to check 20 million years' worth of settings in 20 minutes.

Alan Turing: Sometimes we can't do what feels good. We have to do what is logical