Water (hydro) energy has been used for hundreds of years in watermills and is now often used to generate electricity in places like hydroelectric dams and tidal power plants. Discover the power of water by building and experimenting with various models. Learn how different devices are used to extract useful energy from moving water - from a small stream moving in a water wheel to a giant turbine in a tidal power plant. Build a watermill, sawmill and a hammer to harness the energy of moving water to perform different physical tasks. Explore the intriguing properties of water by conducting experiments involving surface tension, adhesion and cohesion. Learn about water pressure by building a water tower, communicating ships and a water fountain. Build a hydroelectric power plant to generate electricity and light an LED light. Learn where the energy in ocean waves, tides and rivers comes from and discover how they can be used to generate electricity. The full-color, 32-page experiment guide (EN) provides illustrated instructions and scientific information.