This is a bumper collection of 150 simple experiments and projects that explain a wide range of scientific facts and processes, and demonstrate how machines work. All the experiments have an important scientific learning point, but they are enjoyable to do and make science delightfully accessible. Every project or experiment is introduced, described and explained, and this background information not only enables the user to work confidently, but also provides a wealth of additional scientific insight for readers aged 8-12 years.