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Nothing : A Very Short Introduction, by F. Close

considerations representing physics at its best. One should, perhaps, not expect too many researchers to penetrate the details of the story, but those who desire to learn about this field of physics have here available an excellent source of knowledge. When more information is desired, the ample list of references directs the reader to many further works. As is quite proper, the book is dedicated to one of the pioneers of the Swedish School of Precision Spectroscopy, Bengt Edlén.