A good read from The New Yorker. I saw a special on the Enigma Project once and they interviewed a woman who had worked with Turing at Bletchley Park. She basically said that everybody at BP was phenomenally bright, but that Turing was a genius and that the difference between being intelligent and being a genius was the difference between going from A to G and from A to Zed. Genius didn't need the intermediate steps that even the very brightest of us require.
That sounds lonely to me.