Discover how weather conditions occur and change. Build six weather sets with 40 interlocking parts including a rain gauge, thermometer, and wind speed and direction indicators. The Capsela modular science system improves problem-solving and builds scientific knowledge skills as kids create fascinating motorized projects. Children observe how energy changes with the help of visible gears and wheels. Every kit provides easy-to-follow assembly instructions and activities that introduce basic science concepts. Consistent with National Science Education Standards. Two-year warranty!