Riding down hills on a bicycle is super easy -- you barely have to do anything at all. On the other hand, riding up hills requires quite a bit of effort. What if you could store the energy created when you’re blazing down hills or braking and use it later when you’re schlepping up a hill? That seems like a sensible thing to do and is exactly the premise behind the “Copenhagen Wheel.”

Check it out in this two minute video:

We cannot resist the obvious pun -- this startup is reinventing the wheel.

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