This article on this week's discovery of gravitational waves includes the following intriguing statement of what they set out to measure:
"It is equivalent to measuring the distance between the earth and the nearest star with an accuracy of the width of a human hair."
http://www.nytimes.com/2016/02/14/opinion/sunday/finding-beauty-in-the-darkness.html?smprod=nytcore-iphone&smid=nytcore-iphone-share
Einstein's "ripples" should matter to everyone — not just physicists.
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