Newton's Cradle Fridge Magnet delivers a science lesson every morning

I am quite sure that a fair number of us have grown up fascinated by the Newton's Cradle, which is essentially a set up that demonstrates just how one of the laws of physics work, which in this particular case, it would be that of conservation of mass and energy. Well, why not make sure that the next generation, too, is aware of this particular law with the $14.99 Newton’s ...