This attractive and economical Stirling Engine is both engaging and a great educational tool. It runs by exploiting the heat flow generated by the small temperature differences between room temperature and a container of hot water or ice. The Stirling Engine is an External Combustion Engine (the…

This three dimensional model allows students to study our solar system -- looking at planets' relative sizes and colors. Planets can be set by month to show their relative positions. The 5.9" sun is supported on a sturdy base with the outer most (dwarf) planet being 18" from the sun. An illustrated…

Economical and attractive demonstration car model. Can be powered by a solar cell or a rechargeable battery (AA size, not included. Alkaline batteries are not suitable). Battery can be recharged from the solar cell, demonstrating an electricity storage system for solar power. Solar cell can be…