‘Carroll takes us by the hand and with a benign smile and a chatty style, leads us to a place where…at every instant an almost infinite number of copies of you are splitting off to live alternative lives… a wild conceptual ride.’

‘Tackling huge questions, myths and conundrums about our Universe is no easy task, but Carroll does so elegantly.’

'An authoritative and beautifully written account of the quest to understand quantum theory and the origin of space and time.

Sean Carroll is a rare combination of excellent science writer and excellent research scientist. His writing exhibits a clarity of thought that is only available through a deep understanding of the subject. When the book becomes speculative, as it must because it deals with deep and as yet unsolved questions, we know we are in good hands.'

'Something Deeply Hidden is Carroll’s ambitious and engaging foray into what quantum mechanics really means and what it tells us about physical reality.'

'As a smart and intensely readable undergraduate class in the history of quantum theory and the nature of quantum mechanics, Something Deeply Hidden could scarcely be improved.'

'Readers in this universe (and others?) will relish the opportunity to explore the frontiers of science in the company of titans.'

'Fans of popular science authors such as Neil deGrasse Tyson and John Gribbin will find great joy while exploring these groundbreaking concepts.'

'Solid arguments and engaging historical backdrop will captivate science-minded readers everywhere.'

'Carroll argues with a healthy restlessness that makes his book more interesting than so many others in the quantum physics genre.'

'If you want to know why some people take [the Everett] approach seriously and what you can do with it, then Carroll’s latest is one of the best popular books on the market.'

'Be prepared to deal with some equations ― and to have your mind blown.'

'By far the most articulate and cogent defence of the Many-Worlds view in book-length depth with a close connection to the latest ongoing research.'

'Enlightening and refreshingly bold.'

'What makes Carroll’s new project so worthwhile, though, is that while he is most certainly choosing sides in the debate, he offers us a cogent, clear and compelling guide to the subject while letting his passion for the scientific questions shine through every page.'

‘Like all great writers, Carroll has the remarkable ability of putting the reader utterly at ease with his lucid and addictive prose. He leads you so gently and comfortably into his quantum world that you quickly forget you are being given access to the most profound ideas about the nature of reality.’

‘A thrilling tour through what is perhaps humankind’s greatest intellectual achievement – quantum mechanics. With bold clarity, Carroll deftly unmasks quantum weirdness to reveal a strange but utterly wondrous reality.’

‘Sean Carroll’s immensely enjoyable Something Deeply Hidden brings readers face-to-face with the fundamental quantum weirdness of the universe – or should I say universes? And by the end, you may catch yourself finding quantum weirdness not all that weird.’

‘Carroll gives us a front-row seat to the development of a new vision of physics: one that connects our everyday experiences to a dizzying hall-of-mirrors universe in which our very sense of self is challenged. It’s a fascinating idea, and one that just might hold clues to a deeper reality.’

‘Sean Carroll beautifully clarifies the debate about the foundations of quantum mechanics, and champions the most elegant, courageous approach: the astonishing “Many-Worlds” interpretation. His explanations of its pros and cons are clear, even-handed, and philosophically gobsmacking.’

‘[A] challenging, provocative book…moving smoothly through different topics and from objects as small as particles to those as enormous as black holes, Carroll’s exploration of quantum theory introduces readers to some of the most groundbreaking ideas in physics today.’

‘Sean Carroll is always lucid and funny, gratifyingly readable, while still excavating depths… A fascinating and important book.’

‘Irresistible and an absolute treat to read. While this is a book about some of the deepest current mysteries in physics, it is also a book about metaphysics as Carroll lucidly guides us on how to not only think about the true and hidden nature of reality but also how to make sense of it. I loved this book.’

‘A masterpiece…stands along with Feynman’s QED as one of the two best popularizations of quantum mechanics I’ve ever seen.’

‘From physicist Sean Carroll comes a history of quantum discoveries, and a guide to a subject that has baffled and blinded with its potential. Tackling huge questions, myths and conundrums about our Universe is no easy task, but Carroll does so elegantly.’