No, stupid! Use the children! They like going in circles!
A company called PlayPump® has figured out a clever way to get water to people who do not have access to clean water. And as much as I want to point out that children playing on a water pump is still in essence child labor, this does seem like a good idea. Children play on a merry-go-round thing that seems like fun but is actually pumping water for the community to use. It has huge implications and I really do agree that it is a good idea that could better the lives of billions of people.