[I've had this post in the wings for nearly two weeks; I'm dusting it off because end of April seems like a good time to wrap up talking about teaching, seeing as how I DON'T HAVE A TEACHING JOB ANYMORE.]“Three times in my teaching career to date, I have assigned final grades of zero. All three of these students failed make a single appearance in my class during a quiz, a test, or exam; hence the zeroes. The na