If time travel were possible, how would you know if someone visiting from the future was authentic? After all, they would probably tell you things that sounded outlandish or downright crazy. For example, how do you think people would respond to you if you went back to the 80’s and told them that the Terminator would be governor of California and Bon Jovi would have a hit on the country charts? And if you told them Ozzy was basically a sitcom star by now, they would just have you committed.