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This video explains it in very easy-to-grasp terms:

http://www.youtube.com/watch?v=3QnD2c4Xovk



I prefer this one by the Royal Institution:

https://www.youtube.com/watch?v=U62S8SchxX4


Man, now I feel dumb. I was writing Lehmer generators for a semester last year and didn't even notice they are impossible to reverse. Thanks :P




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