Originally posted on VentureBeat:
It may sound like an impossible dream, but two designers in London have built functioning prototypes of GravityLight, a cheap way for people in developing countries t0 light homes, recharge batteries, or power a radio. And they just exceeded their Indiegogo fundraising goal by more than 500 percent with 21 days left in their campaign, so they’ll have the resources to mass-produce the light for less than $5 a unit.
Martin Riddiford and Jim Reeves have spent four years developing GravityLight, which uses the Earth’s gravity to generate enough power to light an LED bulb for half an hour — no electrical grid, batteries, or any external generator required.
Using the GravityLight simply requires removing the small white lamp from its…
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