Those of us who were fans of the old "Amateur Scientist" column of Scientific American will enjoy this collection of projects that look to be fun to build and to play with. These are all things that the author has invented or adapted for a Saturday Science Club for kids near his home in Guildford, UK. Each project begins with a little literary or sometimes historical background, then an estimate of the "Degree of difficulty" precedes a list of materials - "What you need", and directions - "What you do". The science and the math associated with each device is clearly spelled out, and there are suggestions for related investigations and references when they might be useful. My favorite segment, however, is called "The Surprising Parts", where unexpected or unusual characteristics of the projects are described. But what I want to know is: "How do I join that Science Club?"