PositiveForbesAnanthaswamy...is mostly using the \'double slit\' as a means of exploring the various possible interpretations of quantum physics, in much the same way that Adam Becker\'s book from my last group of book reviews does. Along the way, he hits a pretty good range of stuff—the obvious Copenhagen and Many-Worlds discussion, but also a nice and detailed discussion of Bohmian mechanics and a couple different varieties of spontaneous-collapse theories, and even a section devoted to the epistemic new-kid-on-the-block, \'quantum Bayesianism\' (usually shortened to \'QBism\') ... Ananthaswamy explores the variations on the double-slit formula through interviews with a variety of physicists ... This provides some diversity of viewpoints that helps the book feel less narrow than the focus on a single experiment would suggest. Ananthaswamy\'s own voice is not terribly intrusive, making for a very balanced treatment of all the various interpretations considered: each interpretation is described by its own proponents, with a minimum of editorializing.