12 August 2013 Last updated at 19:22 ET
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PrintAlfredo Moser: Bottle light inventor proud to be poor
By Gibby Zobel BBC World Service, Uberaba, Brazil
Alfredo in his workshop
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In today's Magazine
Alfredo Moser's invention is lighting up 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.