Something Deeply Hidden: Quantum Worlds and the Emergence of Spacetime is a non-fiction book by American theoretical physicist Sean M. Carroll.

In this book, Carroll examines the reasons why people misunderstand quantum mechanics and advocates a version of the many-worlds interpretation, while objecting to the views often grouped together as the Copenhagen interpretation.

[1][2] Reviews in Publishers Weekly and Kirkus were generally positive, while the latter noted that Carroll's "eschewing mathematics" may have been somewhat detrimental when discussing topics that "might benefit from at least a little math," observing, "Readers who remember freshman college physics will be intrigued; others will struggle.

"[3][4] Physicist and writer Adam Frank in his review for NPR wrote that he did not in the end find Carroll's arguments convincing (Frank himself leans in the direction of QBism), but that Carroll's case was "carefully reasoned" and his presentations of the various opposing views were fair.

[7] The book was also reviewed by science writer Philip Ball and by physicist-authors Chad Orzel and Sabine Hossenfelder.