Stein: When I was in grad school, I had this math teacher who was really fat. He was like, three of me!
Student: Oh my god.
Stein: Whenever we walked into his office for help, he would be lying down on his couch. He would make us go to the whiteboard and tell us what to write. One day, he told us, "You may not think that I do any math, but I do! On my couch! In my head! You kids need to have more couch time..." I didn't learn a lot from that teacher, but the one thing I learned from him was that it's necessary to have "couch time"