Pretty mind-blowing. Did you know that time is pear-shaped? Yeah, me neither. For a while I could kind of pretend that I understood the theories that Hawking was talking about, but at a certain point I was just like, woah, I think you lost me at general relativity. But I appreciated that he made the effort for us non-positivist earthlings. He writes kind of like one would expect Sheldon Cooper from the Big Bang Theory to write, with a quirky and dry sense of humor. It's certainly nice to know that the universe is nothing quite like we would ever expect.