From the foreword: This book is an independent collection, not a direct continuation of the first book of "Entertaining Physics" ... In the proposed book, as in the first, the compiler seeks not so much to convey new knowledge as to revive and refresh the simplest information on physics that the reader already has. The purpose of the book is to stimulate the activity of scientific imagination, to teach to think in the spirit of physics and to develop the habit of using their knowledge in a variety of ways... In general, this collection on the selection of material is intended for a somewhat more prepared reader , than the first book of "Entertaining Physics" , Although the difference in this respect between the two books is so slight, that they can be read in any sequence and independently of each other.