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 and 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 and quantum mechanics to time travel and the meaning of life, Carroll presents a dazzling new view of how we came to exist.

'Forget Stephen Hawking's Brief History: this mind-blowing book is the real deal... Fascinating.' 

'Carroll's insight will intrigue anyone... Most enjoyable.'

Sean Carroll is a theoretical physicist at the California Institute of Technology. In addition to the Royal Society Winton Prize, he has been awarded prizes and fellowships from the National Science Foundation, NASA, the American Physical Society and the American Institute of Physics. He lives in Los Angeles. Follow him @seanmcarroll and read his blog at preposterousuniverse.com.