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Alfredo Moser: Bottle light inventor (2013)

Brazilian mechanic Alfredo Moser has developed an ingenious way of lighting up homes without using electricity. And his idea is spreading around the world.

In 2002, the Brazilian mechanic had a light-bulb moment and came up with a way of illuminating his house during the day without electricity - using nothing more than plastic bottles filled with water and a tiny bit of bleach. Carmelinda, Moser's wife of 35 years, says her husband has always been very good at making things around the home, including some fine wooden beds and tables. In the Philippines, where a quarter of the population lives below the poverty line, and electricity is unusually expensive, the idea has really taken off, with Moser lamps now fitted in 140,000 homes.

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