Kaku is famous for promoting string/M-theory in a variety of books from hyperspace to physics of impossible, to name a few. He also popularizes string theory in radio and sci-fi documentaries. He was asked what he thought of loop quantum gravity: Antimatter How much closer are we at this point to a Theory of Everything? Are the string and loop theories the best we have right now? Michio Kaku Personally, I think we already have the theory of everything, in the form of string theory. Loop theories are not really a competitor, since loop theories do not contain any matter, plus they are probably divergent. Loop gravity theories only contain pure gravity. Once matter is added, they blow up horribly. It's possible that when these loops touch, they also blow up. So far, string theory is the only theory which does not blow up, and contains matter. The problem with string theory is that we cannot test it directly, since we are a puny Type 0 civilization. The true realm of string theory is the Planck energy, which only a Type III civilization can manipulate at will. http://rogerobregon.com/michiokaku.htm [Broken] Questions? Is it true loop theories do not contain matter, only contain pure gravity, and "blow up" when matter is added? What does Kaku mean when he says when loops in LQG touch, they blow up?