Again, a superior physics text! It’s much better than Feynman’s third volume dealing with similar topics. But Susskind and Friedman seem to be out to teach. Feynman was out to amaze.  This installment of the “Theoretical Minimum” series provides the best exposition of quantum information theory and entanglement I’ve seen. But the series seems a little disappointing in two senses.<br><br>First, we’re told the truth about quantum measurement. It’s really not very intuitive and to master it, you have to adapt yourself to some pretty esoteric mathematical tricks. These tricks are ultimately useful, elegant and important. But you really have to work to absorb them all. And, as I said, the results aren’t very intuitive.<br><br>It is clear that the series is veering in the direction of cosmology and particle physics. My interests are more in understanding field theory for solid-state applications (after many years working in engineering electronics.) Of course, solid-state physics, the study of collective, many-body phenomena has a lot of overlap with particle theory. After all, Anderson’s work certainly pointed Higgs, et al. in the direction of the Higg’s Boson. But all the same, I’d like to see more “mundane” topics, like density functional theory, or the quantum field theory of solids in subsequent volumes.