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Mother Nature Network • What is GravityLight? A $5 battery-free lamp for...

01

Feb


 What is GravityLight? A $5 battery-free lamp for the poor 



Inventors Martin Riddiford and Jim Reeves realized they could eliminate the need for a battery if they relied on the power of gravity.
Inventors Martin Riddiford and Jim Reeves realized they could eliminate the need for a battery if they relied on the power of gravity.
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