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Tremendous lighthouse, this. It has the largest Fresnel lens in the world (4 tons!), hand ground in France. It was lifted up from the ocean 110 feet below, and when eventually installed, spun on a friction-reducing bed of mercury until an electronic light replaced it in 1976.

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Solar power becoming more affordable - “Last month, Japanese electronics giant Sharp Corporation showed off its new system for focusing sunlight with a fresnel lens (like the one used in lighthouses) onto superefficient solar cells, which are about twice as efficient as conventional silicon cells.”

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