A simple initiative in the Philippines is bringing a bit of brightness into the lives of the country's poorest people. The project is called "Litre of Light", and the technology involved is just a plastic bottle filled with water. It's an environmentally-friendly alternative to an electric light bulb, and it's virtually free. The BBC's Kate McGeown reports from Manila.
http://www.bbc.co.uk/news/world-asia-pacific-14967535
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