I already mentioned the two different reviews on her book, and how each one is perceived quite differently by me. Now along comes a third review of the same book, published in the Washington Post, but this time written by a "... an old-line physics prof...", which makes certain passages in the review even more puzzling. Try this one:
With one exception: the world inside the atom. I would suggest that this strange world is one place the brain is simply not wired to understand. Oh sure, we can write equations and predict the results of experiments to umpty-ump decimal places, but there remains something essentially unknowable about the inside of the atom. It is the challenge of taking on this world and, if not explaining it, at least explaining why it is unexplainable that Louisa Gilder tackles in The Age of Entanglement.
Some background: Inside the atom everything, including matter and energy, comes in little bundles called "quanta." (The name derives from the Latin for "bundle" or "heap.") The old word for the science of motion is "mechanics," so the science that applies inside the atom, the study of the motion of things that come in bundles, is called "quantum mechanics." The basics of the science were developed in the early 20th century, and a major shift in the field took place with the discovery of what is now called "entanglement," in the 1960s and '70s. Gilder, therefore, splits her narrative into two parts, one dealing with early developments, the other with entanglement and its ramifications.
I'm not sure if the reviewer is using the example of "inside the atom" because this is what Gilder is using, but this is rather misleading at best. QM isn't about everything "inside the atom". A free electron can also be governed by QM (see the double-slit expt using free electrons, or any low-energy electron diffraction (LEED), etc... etc.). Furthermore, technically, a conduction electron is not "inside the atom", but rather isn't localize to any particular atom or location. Yet, QM is certainly applicable and more accurate here.
One can, of course, see an inconsistent with the description because the book is also describing quantum entanglement, which typically is demonstrated using light OUTSIDE of an atom. So that passage quote above not only gives a misleading impression that QM is only inside an atom, but anyone paying attention would also be confused by it.