As I read this article I was very fond of the whole structure around it, Dr. Kaku discusses the issues that lie around time travel and the different paradoxes that occur." One stubborn problem with time travel is that it is riddled with several types of paradoxes. For example, there is the paradox of the man with no parents, i.e. what happens when you go back in time and kill your parents before you are born? Question: if your parents died before you were born, then how could you have been born to kill them in the first place?" This is interesting to think of, especially since most people have "thought" about that idea or an idea similar. So what Dr. Kaku goes on to discuss is how time travel can occur but not without energy. He goes on to say without energy you can not accomplish anything, and the laws of quantum gravity will not allow energy to travel backwards (see first article for clarification on parallel universes). What this means is we would have to pretty much go around the universe and around the time space continuum and wrap around without fracturing the space time existence. A lot of confusing and scientific words right? Yeah, I understand 15% of this article.
http://mkaku.org/home/articles/the-physics-of-time-travel/
http://mkaku.org/home/articles/the-physics-of-time-travel/