Hi, I'll attend a lecture around 14 hours later addressed by a Nobel laureate and here's the brief description of the lecture. "Starting from a Parlor Game, I shall show how a deep mathematical problem can be formulated in an elementary way. The steps are understandable to high school students. Applications to knot theory, word problems and to statistical mechanics are indicated." Part of the students attending the lecture will be high school students like me. I want to do a little bit preparation before attending the lecture, so I would like to know what knot theory is. Also what is a Parlor Game? Can anyone please provide me with some elementary information about these or just give me some links with simple descriptions? Thanks.