In 1939, there was a student by the name of George Dantzig running late for a statistics class at Cal Berkeley. He was about 20 minutes late and slipped into class unnoticed. He saw there were some problems on the board, so he wrote them down, assuming it was homework, then he continued to listen to the lecture. When he got home, he realized the homework problems were pretty challenging. Nevertheless, he took a few days and finished the problems and turned them in to his professor.