How a $5 gravity-powered LED could revolutionize cheap lighting
"An LED light that runs on rope pulls and gravity has been developed, which could be good news for developing countries without access to stable lighting. GravityLight, a crowdfunding campaign and product created by British designers Martin Riddiford and Jim Reeves, allows a cheap LED kit to run for up to thirty minutes — for free — through no more than a three-second pull on a rope. The energy source after this? Something free that everyone has access to — gravity." Continue reading →