4.0

As a physicist I must subtract one star for the physical inaccuracies said about quantum physics, particularly about Schrödinger's cat (which was Erwin Schrödinger's idea of showing how quantum physics - so physics on a microscopical scale - CANNOT be expanded to our everyday physics on a macroscopical scale). From a physical view why this, and hence the main idea of this book, is not possible was explained in the 1980s as 'decoherence'. I can't stand it when people who know absolutely nothing about physics talk about something so complex as quantum physics just because they once heard 'Schrödinger's cat' or read the first sentence of a wikipedia article.
Also Nora saying that physicists believe in String theory is just wrong. I've encountered so many physicists and only the minority believe in it. Some 'physicists' also believe that Covid does not exist or that there is no man-made climate change. So please don't take one idea of a few physicists as your explanation for the main idea of your book.

I would have rather liked it if it were just fiction without physical nonsense explanations.

Other than that, I truly enjoyed the message of the book and found Nora's different possible lives fascinating and entertaining.