In this book you will find descriptions of amusing experiments, which are based upon well-known scientific facts. You can easily carry out these experiments yourselves, and you will not need any special equipment. But if you wish to show the experiments to your friends, we advise you to practice them a few times before you demonstrate. The experiments are not only amusing. After you have carried out each experiment and read the explanation, you will learn something interesting and important in such fields of science and mathematics, physics, chemistry, biology, astronomy and psychology. The book will help you to learn a number of new words which are connected with science. When you have learnt them, it will be easier for you to read scientific literature in future.