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Stephen Sekula (steve@chirp.cooleysekula.net)'s status on Saturday, 29-Feb-2020 14:01:03 UTC Stephen Sekula From Sydonahi https://twitter.com/Sydonahi on Twitter: Great visualisation of how convex and concave lenses bring light rays to focus and diverge. #Science #Physics #ScienceFacts https://twitter.com/Sydonahi/status/1233660847542562817/video/1 https://chirp.cooleysekula.net/attachment/63240