I guess everyone feels they need a time machine every now and then. Go back and undo a goof, or maybe change something major to take another route in life? [insert your favorite deity] knows I could use one sometimes! If you want one, a DeLorean and some plutonuim apparently wont cut it. Dr. Michio Kaku explains the basics of string theory. A must know for anyone attempting to go back and prevent JFK from getting shot. I was hoping for something more solid, like blueprints or something, but I'll keep searching and keep you posted. Link below. http://bigthink.com/ideas/41614