Here’s an idea. Take a look at PlayPumps, for the developing world. Kids play on a merry-go-round and pump water for the village:

Thanks to Guy Kawasaki for picking this up in How to Change the World: “The Cleverest Idea I’ve Seen In Years”

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Tim BerryTim Berry
Tim Berry

Tim Berry is the founder and chairman of Palo Alto Software and Bplans.com. Follow him on Twitter @Timberry.