Oh, man. I am such a nerd. I seriously love this stuff.

I figured, if I'm going to write science fiction, I should probably understand the science behind these stories, right?

I took a physics class in college: ONE class: Astronomy. It was a great class. My professor knew so much and he covered several topics within physics, including the theory of relativity. I understood a lot of the basics that Einstein explored, but the overall concept of time travel eluded me.

So I turned to wikipedia.

This...