A household lamp powered by a bag of rocks. More than 780 million people rely on kerosene to light their homes. But the fuel is pricey and is toxic when burned--not to mention a fire hazard. In 2008, London-based product designer Martin Riddiford and his colleague Jim Reeves decided to create a cheap, safe alternative. Riddiford knew a falling weight could produce enough energy to run a grandfather clock, so why not a light? To find out, he attached the crank of a wind-up flashlight to a bicycle...
A household lamp powered by a bag of rocks. More than 780 million people rely on kerosene to light their homes. But the fuel is pricey and is toxic when burned--not to mention a fire hazard. In 2008, London-based product designer Martin Riddiford and his colleague Jim Reeves decided to create a cheap, safe alternative. Riddiford knew a falling weight could produce enough energy to run a grandfather clock, so why not a light? To find out, he attached the crank of a wind-up flashlight to a bicycle...
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