Cosmic dust found in city rooftop gutters PhysOrg, December 7, 2016
https://phys.org/news/2016-12-cosmic-city-rooftop-gutters.html http://www.sciencealert.com/cosmic-dust-has-been-discovered-on-city-rooftops-for-the-first-time The paper is: Genge, M.J., J. Larsen, M. Van Ginneken, and M.D. Suttle, 2016, An urban collection of modern-day large micrometeorites: Evidence for variations in the extraterrestrial dustflux through the Quaternary. Geology, First published online December 2016, doi: 10.1130/G38352.1 http://geology.gsapubs.org/content/early/2016/12/05/G38352.1.abstract https://spiral.imperial.ac.uk/bitstream/10044/1/42484/9/Geology-2016-Genge-G38352.1.pdf Yours, Paul H.
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