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These merry-go-rounds use kid power to pump water in developing countries, so far 700 PlayPumps have been installed in South Africa - "While children have fun spinning on the PlayPump (1), clean water is pumped (2) from underground (3) into a 2,500-liter tank (4), standing seven meters above the ground.…
Here's a neat idea from Popular Science 1933, best tested on MythBusters now (they just tested if a plane could take off from a treadmill)... a merry go round airplane launcher, what do you think would happen? At least it would be more fun than most airport experiences - Link.
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