Solarbotics Perpetual Motion Marble Kit

Solarbotics Perpetual Motion Marble Kit Ever since motion was invented, people have wanted to build machines where it never stops. Alas, there are many things which prevent this from happening (which we can sum up in one word: science). BUT, there are a lot of people out in the world who don't know about this science thing, and who will believe anything anyone tells them or sort of shows them...