For the better part of a century, attempts to explain what was really going on in the quantum world seemed doomed to failure. But recent technological advances have made the question both practical and urgent. An imaginative group of physicists at Oxford University have risen to the challenge. This is their story. Oxford is the center of the many-world theory. This theory, which stands in opposition to the single-world view (including randomness and conscious but unseen cat-collapsing powers) promotes the idea that countless versions of reality unfold side by side. At long last, there is a sensible way to think about quantum mechanics. The new view abolishes the need to believe in randomness, long-range spooky forces, or conscious observers with mysterious powers to collapse cats into a state of life or death. But the new understanding comes at a price: we must accept that we live in a multiverse wherein countless versions of reality unfold side-by-side.