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  • (cur | prev) 13:40, 1 May 2019‎ MamiePerkins856 (talk | contribs)‎ . . (4,854 bytes) (+4,854)‎ . . (Created page with "A decade ago, Dutch astronomer Frans Snik invented a simple optical device to measure the density of dust, soot and other particles, or aerosols, in the atmosphere that affect...")
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