Gravity-Powered Light

GravityLight, an idea from two British designers, is something completely different. It gets its energy from gravity: a 22-pound bag of sand that gradually cranks a gear-train attached to a D.C. motor. One lift is enough for 30 minutes of light, and recharging is as simple of pushing the weight up again.

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Ludwick Marishane: A bath without water

If you had to walk a mile for a jug of water every day, as millions of people do, it’s unlikely you’d use that precious water to bathe. Young entrepreneur Ludwick Marishane tells the amazing, funny story of how he invented a cheap, clean and convenient solution: DryBath, the world’s first bath-substituting lotion.

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Avaz – speech synthesizer for speech-impaired children

AVAZ provides a ‘voice’ to a non-verbal child with Cerebral Palsy, allowing him/her to communicate with friends, family and teachers. By enabling speech-impaired children to communicate easily, this device is helping them become much more independent and free from their existing barriers.

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Husk Power – electricity from crop waste

Bihar is one of the most poorly-served states in India when it comes to electricity. Husk Power is connecting remote villages in Bihar to a clean, reliable electricity supply, which provides better light, harnesses a widespread waste product and costs less than alternatives. Husk Power’s 65 plants gasify rice husks and other biomass waste to supply electricity to around 180,000 people and, by replacing kerosene, they cut greenhouse emissions by over 8,000 tonnes of CO2 a year. The company is growing rapidly, aiming for over 2,000 plants in operation by the end of 2014.

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