A few months ago I read Hoffman's book A Case Against Reality. It was an interesting read, one in which I ended up learning more about quantum mechanics than I ever thought I would when I picked the book up. Frankly I think the book could be distilled down to a much shorter version, as the central concept was not a particularly complicated one, just one which challenges conventional ways of thinking. I think this talk does a better job. If your curious to learn more about the science that supports this particular way of thinking or a more in depth exploration of what it means, particularly with relevance to the concept of spacetime, I'd suggest giving the book a read.