I had a comp sci prof back in the early 1970's. Someone told me that he had gotten a check from Knuth for finding an error. I saw him off campus once and I

I had a comp sci prof back in the early 1970's. Someone told me that he had gotten a check from Knuth for finding an error. I saw him off campus once and I had to check to see if his feet actually touched the ground. I swear that they didn't.