>His reply was yes, but not many. He mentioned a guy in Germany who goes over his books again and again looking for errors. I call these types of people "moles

>His reply was yes, but not many. He mentioned a guy in Germany who goes over his books again and again looking for errors. I call these types of people "moles" because I imagine they basically never see daylight. Thank god for these people. If I ever have the time and will power to study TAOCP it will be a very relaxed mindset, knowing that with a high probability I can be confident that the book, exercises and solutions are error free.