"We're going to talk about shortest paths, and we're going to talk about shortest paths for three lectures. So, this is a trilogy. Today will be Shortest Paths One. I've been watching far too many versions of Star Wars this weekend. I saw the musical yesterday, matinee. That was an MIT musical. That was fun, of all three movies in about four hours. That was a bit long and then I saw the one-man show on Friday. One-man Star Wars: the original three movies in one hour. That was the opposite of too long. Both were fun. So I get my trilogy fix. All episodes, first we're going to start with The New Hope, and we're going to talk about the shortest paths problem and solve one particular problem of it, a very interesting version...