There are 100 quizzes of 10 questions each, graded and colour-coded for difficulty. You can use these to test what you already know about the world of science and technology but they will also lead you into finding out more about the subject, as each question is accompanied by a cross-reference to the relevant pages in the reference section. These pages give you the answer to the question plus masses of other interesting information on the topic. There's also a quick answer section at the back of the book with a blank question and answer sheet. The core reference section is packed with facts on the various branches of science and their application in the world around you. Learn about the key developments in science and technology through the ages. Find out how buildings are constructed; how electricity works; how trains, cars and planes operate and the technology behind them; learn all about the development of TVs, radios, photography, computers; the structure of living organisms; genetics, DNA and much, much more. simply want to browse, you will find that each fascinating piece of information leads you on to discover another and another and another...