Demonstrates Newtons Law of Conservation of Energy as clearly as is possible. Simply release any number of balls on one side, and the same number will rise from the other. You don't have to be Chinese to operate this amazing calculating device but it helps. For the rest of us there is an instruction book. Beautifully made of wood with brass trim.
Light makes the little vanes spin.
A classic science toy everyone remembers from years ago. Metal Safe Bank. Looks and works just like a real safe. Head, arms, legs and tail all move. You'll want to have this monster in your collection.