An ghost image continuing to appear in one’s vision after the exposure to the original has ceased.
Monday, March 14, 2011
Pi Day
A Brief History of pi
“Pi has been known for almost 4000 years—but even if we calculated the number of seconds in those 4000 years and calculated pi to that number of places, we would still only be approximating its actual value.”Here’s a brief history of finding pi on the Exploratorium’s site, more on the pi Day site. and a Facebook page.
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