TIL about ulexite, “tv rock” natural mineral that acts like optic fiber http://en.wikipedia.org/wiki/Ulexite
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You can buy some on amazon for $10 https://www.amazon.com/Copernicus-CCTV-TV-Rock-Ulexite/dp/B002FPF9H2 …
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Replying to @vgr
They've also made the concrete block version of thispic.twitter.com/raJL9XQeYz
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