> When historian Charles Weiner looked over a pile of Richard Feynman’s notebooks, he called them a wonderful ‘record of his day-to-day work’.

> “No, no!”, Feynman objected strongly.

> “They aren’t a record of my thinking process. They are my thinking process. I actually did the work on the paper.”

> “Well,” Weiner said, “The work was done in your head, but the record of it is still here.”

> “No, it’s not a record, not really. It’s working. You have to work on paper and this is the paper. Okay?”, Feynman explained.