RT @HumanProgress: Nordhaus estimates that the price of light per 1,000 lumens (a lumen is a measure of how much visible light is emitted b… 0 atbildes
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Agris Krusts (2018-10-19 07:13:10) |
RT @HumanProgress: Nordhaus estimates that the price of light per 1,000 lumens (a lumen is a measure of how much visible light is emitted b… | |