With fossil fuel sources becoming scarce and increasing concern over pollution, it's becoming more important than ever to explore alternative sources of energy. Easy to use, the Fuel Cell Car Kit X7 demonstrates hydrogen as an alternative energy source for automobiles. The Power House kit focuses on the heat and light energy from the sun and the energy from the wind, as well as electrochemical and plant energy. The Salt Water Car Kit gives children a chance to learn about new forms of clean energy while building and powering their very own toy: Just add saltwater and go! The PowerWheel is a micro hydro generator - an amazing tool for teaching lessons about energy, hydropower and other renewable sources of energy. Use Solar Cells to power small motors or other electrical devices which draw small amounts of current.