Twenty years after Stephen Hawking's 9-million-copy selling A Brief History of Time pioneering theoretical physicist Sean Carroll takes our investigation into the nature of time to the next level You can't unscramble an egg & you can't remember the future But what if time doesn't (or didn't!) always go in the same direction? Carroll's paradigm-shifting research suggests that other universes experience time running in the opposite direction to our own Exploring subjects from entropy & quantum mechanics to time travel & the meaning of life Carroll presents a dazzling new view of how we came to exist