There are a couple of ways that human beings can power devices. One is to use physical force, like pedaling or pushing to transfer energy through a mechanical system to do work. The second way is to use movement to create electricity which is collected or routed to do work. Either way, work gets done.
The following cluster offers a collection of tools and devices that leverage physical output in one way or another. You’ll find some are familiar, some are bits of "ah ha," and some are downright brilliant.
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45 Devices for Human Dynamos
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Green Children's Toys
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Kinetic Contraptions that Yield Rewards for Physical Effort
By: Katie Cordrey - Published: Jan 7, 2009