On November 5th, 1955, Dr. Emmet Lathrop Brown (Doc Brown to his friends), was attempting to hang a clock in his bathroom. As he reached over, he lost his footing , slipped from the toilet that he was standing on, and struck his head against the side of the sink.
Unconscious, Doc had a vision. And that vision was that of a Flux Capacitor — the device that makes time travel possible.
Requiring 1.21 gigawatts of electrical power and to be moving at a speed of 88 mph (142 km/h) the Flux Capacitor allows one to move forward or backwards in time.
Dr. Emmet Brown, on this day in history, we salute you, and remember your red letter date in the history of science!
Dr. Emmett Brown: Then tell me, "Future Boy", who's President in the United States in 1985?
Marty McFly: Ronald Reagan.
Dr. Emmett Brown: Ronald Reagan? The actor? Then who's VICE-President? Jerry Lewis? I suppose Jane Wyman is the First Lady!
Marty McFly: Whoa! Wait! Doc!
Dr. Emmett Brown: And Jack Benny is Secretary of the Treasury.
Marty McFly: Doc, you gotta listen to me.
Dr. Emmett Brown: I've had enough practical jokes for one evening. Good night, Future Boy!
Marty McFly: No, wait! Doc. Doc. The-the-the bruise - the bruise on your head. I know how that happened! You told me the whole story. You were standing on your toilet, and you were hanging a clock, and you fell, and you hit your head on the sink. And that's when you came up with the idea for the Flux Capacitor... Which... is what makes time travel possible....