One of the best videos on solar water light bulbs I've seen yet. Written translation / instructions in English. Technique discovered by Alfredo Moser in Brazil during an energy blackout. Use a two liter plastic bottle with clean water and 2 capfuls of bleach, and cover the cap to protect the cap from the sun. See more on video:
http://www.youtube.com/watch?v=_zMAWztZ6TI, Uploaded by KAWUNEARTH on May 8, 2008
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