As I was grading exam papers in drinking coffee at OC Mix, a middle-aged guy spoke to me that he used those bluebooks in the 1970s and was surprised but really glad to see that we're still using them today.

I wondered for a long while why I had such a difficult time in teaching undergraduate courses and finally hit on an answer today: I do not remember any professors who impressed me so much so that my life had changed ever since. Well, there…