Max Tegmark takes us on a mind-blowing journey through the past, present, and future as well as through the physics, astronomy, and mathematics that form the basis of his work, most notably his theory of the ultimate multiverse and the hypothesis that our physical reality is a mathematical structure. He not only explains his frequently complex theories to us in a brilliant blend of popular and ground-breaking science, but he also discusses with us some of the frequently unexpected victories and setbacks that have moulded his career as a scientist.