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Stephen Sekula (steve@chirp.cooleysekula.net)'s status on Wednesday, 10-Aug-2016 02:01:43 UTC Stephen Sekula Exploring lenses: how to measure their properties, how they form images, and how to make a telescope. #PHYS1311 https://t.co/2kK5Y0XIlc https://chirp.cooleysekula.net/attachment/14032