A physicist who has figured out how to harness light to facilitate time travel isn't worried about paradoxes. "There would be government laws to control time travel, he believes." Of course, my first action as ruler of the world would be to go back through time and repeal that law. Oops, I'm channeling Dogbert again. This nutty professor also dismisses the grandfather paradox by explaining that parallel universes would take care of it all. This is the kind of guy who, after he accidentally creates the first black hole on earth, and shortly before we all die, says, I didn't expect that I wouldn't be able to control it.