The manuscript of the book on nuclei, atoms and molecules was prepared by A.F. Buyanov a few years ago. The publishing house "Young Guard" in 1959 published the book "Lords of Atoms," which included only the third part of the manuscript prepared by the author - about the world of small and large molecules. Subsequently, A.F. Buyanov turned to Gosatomizdat with a proposal to publish the book in its original form, albeit with a significant revision, including material on molecules. Unfortunately, A.F. Buyanov died tragically and therefore the preparation of the book for publication took place without his participation. The title of this new book is also given by the publisher. This is the story of the creation of the book "Nuclei, Atoms, Molecules" offered to the reader.