When you look at the calculation, it's amazing that every time you try to prove or disprove time travel, you've pushed Einstein's theory to the very limits where quantum effects must dominate. That's telling us that you really need a theory of everything to resolve this question. And the only candidate is string theory.

I like to engage the public because when I was in high school, I had all these questions about anti-matter, higher dimensions and time travel. Every time I went to the library, every time I asked people these questions, I would get some strange looks. Nobody could answer any of these questions.

Anything that promotes a kernel of science, even though it's exaggerated and hyped by Hollywood, I think is a step forward. We in the ivory tower ultimately have to realize that in some sense we have to sing for our supper.

Michio Kaku Quotes