John von Neumann was one whose talents reached so widely, I could talk to him about the puzzles of the geometry around what we today call a black hole. He was close to getting a solution to that, but he had not quite got it. A younger colleague here, Martin Kruskal, got the solution, and I converted it, naturally, into a drawing, because I can't understand anything without a picture, and got Martin to publish his result with a drawing. But John von Neumann talked about the geometry around what we call a black hole today, I'd get him to help review the possibilities of nuclear weapons. The project Matterhorn, as you'll recall, we put together a summary report, PMB, 1932, was it? Or was it 1931? Anyway, John von Neumann had gone over that and made various suggestions, which we fed into the text. John von Neumann had designed the lenses which were used in getting a good implosion at Los Alamos, to make the bomb work. He was entranced with the Quantum Theory of Measurement and what quantum mechanics means and implies. Although I can't say that there's any insight he gave there that I have been able to capture and make much out of. I was at an after-dinner party at the home of our friend - I will remember his name in just a minute - the chemist - unfortunately he died just a few months ago, here at Meadow Lakes -- but he, in the after dinner discussions, got things going along the idea of how a computer might be in the future. And von Neumann joined in that discussion vigorously, and at the end of it all he said "I think I'll go and look into this some more." And von Neumann, by George, he was one of the great men of the computer world.