Cosmic dust found in city rooftop gutters

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 dust flux 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.