Maxwell von Stein’s bike has a great big flywheel in the middle of its frame. It stores energy when the bike slows down and then feeds it back to the wheels when you need a boost. It’s like the regenerative braking used in a hybrid car, only the motion is stored as motion instead of [...]
Source: http://www.wired.com/gadgetlab/2011/08/regenerative-flywheel-powered-bicycle/
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