Two thumbs up (in superpostion)! By far the best overview of Quantum theory that I've read thus far (out of 10 books). The author doesn't pick and choose from the competing interpretations of QT to advance an agenda, (philosophical, social, political, or scientific). QT development is presented in its historical context with all the resistance that accompanies new theories. Alternatives to the orthodox Copenhagen interpretation are fairly presented. All the mathematics are thankfully placed in appendices at the end of the book. Still, some of the text explaining experimental setup and reasoning was too technical for me, but I grasped the gist of the "interpretation." The meaning of QT is still being debated. The many interpretations articulated in the many theories designed to explain microphysics phenomena essentially boil down to 2 competing metaphysical postions: the "anti-realist" Copenhagen interpretation (Heisenberg, Bohr, Pauli) and the "realist" hidden variables interpretation (Einstein, Schrodinger, Bohm, etc.). This is obviously an oversimplification, but I can confidently now state that I understand that I don't understand Quantum Theory.