TIL about ulexite, “tv rock” natural mineral that acts like optic fiber http://en.wikipedia.org/wiki/Ulexite
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Here’s a nice kit of fiber optics experimentshttps://www.arborsci.com/products/adventures-in-fiber-optics-kit …
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Here’s the experiments manual. Reading it was illuminating. https://asc-mag-media.s3.amazonaws.com/datasheet/Adventures_FO.pdf …
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They've also made the concrete block version of thispic.twitter.com/raJL9XQeYz
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