Want to harness the energy of the kids? Someone's figured out how!

These children are having a blast. They're playing on ... a pump!— a merry-go-round like a playground toy. As kids spin it around, they draw gallons of pure water from an underground well and into an elevated storage tank. It all flows to a free tap for this community of 1,000 people in rural South Africa.

I've often wondered what could be done on a practical level. They've got so much energy - shouldn't we be able to harness just a bit of it? There are reasons child labor laws exist in this country. Good reasons. But shoot! Give them a toy that pumps water to the village? Brilliant!