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A clever invention: A bicycle that uses a flywheel to store energy.
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When you need to brake, the energy transfers from the wheel to the flywheel, which spins between the crossbars.
The flywheel stores the kinetic energy until the rider needs a boost, then he can transfer the energy back to the wheel using a shifter on the handlebars.
Inventor: Maxwell von Stein (22), graduate of "The Cooper Union"
