Speaking of pen and paper... When I was in college, Dijkstra had given a talk for the class a few years before his death, and my instructor passed out his notes. They were on a non-ruled piece of paper with perfectly drawn bullet points for each item. If he made a mistake, he would scratch the word out with a near perfect rectangle. The neatness and clarity was striking. I think it was the only handout in my entire time at the university that was hand written and photocopied instead of typed up on a computer... and it was from one of the most famous computer scientists.