Video: Environment

Bringing light to the poor, one liter at a time (2:56) 

July 11 - A bottled liter of water with a few teaspoons of bleach is proving to be a successful recipe for dwellers in the light-deprived slums of the Philippines. The simple technology is spreading sunlight in places where it has never been, and saving residents money at the same time. Gemma Haines reports. ( Transcript )

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