Since the dawn of time, certain questions have plagued the deepest crannies of mankind's heart. Are we alone in the universe? What happened to the dinosaurs? Who built Stonehenge? Why is there Daylight Savings Time, and if we have to have it, why couldn't they just make it so that it always gives us an extra hour of sleep? These are all important questions, obviously, but Mythbusters has finally tackled one of the big ones: was it really necessary for Jack to sacrifice himself at the end of Titanic or could both he and Rose have floated on that door? Director James Cameron joined the buster boys to lay this question to rest once and for all, and you can read the answer here. (Spoiler Alert: it's exactly what you think) ...