The human
body can deliver enough power to drive computers, television sets and washing
machines – but it does go hand in hand with lots of sweat.
Eco-tech boffins
dream of self-sufficient gadgets: mobile phones fed by solar energy, heartbeat-powered
music players. However, the potential of these energy sources is much too
small. Handles, cranks and biking machines on the other hand, do have a promise
to be a powerful energy source. Swinging a crank for fifteen minutes is enough
to power a mobile phone. Less than an hour of pedalling a bike can power larger
machines. The only thing missing is a remedy for laziness.
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