Back in college there was a class where all exams were take-home, and all homeworks and exams could be deposited in the professor's mailbox. I read the text, di

Back in college there was a class where all exams were take-home, and all homeworks and exams could be deposited in the professor's mailbox. I read the text, did homework with my classmates, passed the exams, and never even found out what the professor looked like.