Kevin Bacon used to be known primarily for his acting work, though today he's arguably just as well known for Six Degrees of Kevin Bacon, a game in which players attempt to connect any actor in any film with Kevin Bacon, via co-stars in other films ... with as many as six links. An actor can then be assigned a "Bacon Number," which is the number of links necessary to directly associate the actor with Bacon himself, co-starring in the same production. Although Bacon didn't invent the game, it is permanently associated with him.
The Kevin Bacon game is based on a theory called six degrees of separation, the notion that any human on Earth can be connected to any other via social connections (find a "friend of a friend" six times over, and you can span the globe).
So what does Kevin Bacon, who is celebrating his 59th birthday today, think of all this? In 2012, the actor gave a TEDx Talk about the situation, touching on his life, career, and eventual philanthropy related to the game. Enjoy: