Let's Experiment with Energy A lump of coal is a form of energy, but what exactly is energy? Eight delightful experiments teach us about energy and make us use our bodies and brains. Educational and fun, too! Let's spin disks using the energy of light! Watch the disks that spin when a light is shined on them. Actually, the reason they spin is because the hidden solar battery changes 'something' into 'something'!?! Copyright(C) 2002 OMUTA SEKITAN WORLD. All rights reserved.