How the cost of light has fallen by a factor of 500,000 http://paper.li/CMacPlumbing_/1476422738?read=http%3A%2F%2Fhumanprogress.org%2Fblog%2Fhow%2Dthe%2Dcost%2Dof%2Dlight%2Dhas%2Dfallen%2Dby%2Da%2Dfactor%2Dof%2D500%2D000 …
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https://twitter.com/CMacPlumbing_/status/876309925831618560 **Julia J. Tillman / JuliaJTillman / JuliaTillman** https://twitter.com/CMacPlumbing_
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