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  1. In the 1700s, spherical glass bottles filled with water were used to focus candlelight for fine work such as lace making , surgery , http://www.explorato...er_sphere_lens/ Today, this technique of the sphere lens magnifier is still used , While searching the web, I came across on this Spanish site , This is the google translation , https://translate.go...t-text=&act=url http://www.nippon.com/es/views/b02306/ Liter of Light , Wiki , Is a global open source movement with the aim to provide an ecologically sustainable and free-of-cost source of interior light to rooms in simple dwellings with a thin roof. The device is simple: it is a transparent 1.5-2l plastic bottle, as typically used for carbonated drinks, filled with water plus a little bleach to inhibit algal growth, fitted through the roof of a house. During daytime the water inside the bottle refracts sunlight, delivering about as much light as a 40- to 60-watt to the interior. A properly installed solar bottle can last up to 5 years , https://www.google.b...ved=0CAgQ_AUoAQ
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