I was visiting an old friend in college and he was showing me around campus. It was getting dark out when we entered the dorm. The first floor was unusually spacious and the lighting was sparse. I asked him how many people lived in the building. “600″, he said. “What? No way.” I couldn’t imagine that the dorm housed anywhere close to that number. I walked around the perimeter of the first floor and peered through some open doorways. The unoccupied rooms were about as big as you would expect for a regular dorm room.