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$\begingroup$ If I scraped dirt off the roof of my house, would I find traces of rock from space? Could I see it is space rock under a home microscope? Could I drop the dirt into water and see denser space rock sinking faster? Is there any simple home experiment I could do to determine I have got some rock from space? $\endgroup$ $\begingroup$ Can you find (occasional) micrometeorites on the roof of your house?
PETER ERWIN and PETER SHACKLE describe a new metric for characterizing the flicker of light sources and illustrate how some popular sources, including AC-LED light engines, perform based on that metric.
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