March 14 Happy birthday Albert Einstein - Born today in 1879. Happy Pi Day (3.14) to everyone else. Measure the circumference of a flat circle of any size. Divide by its diameter, and you get Pi. The approximation 3.14 is 99.95% accurate. Good for most Pi emergencies.
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@neiltyson Happy Birthday to Albert Einstein and Happy Pi Day.
@neiltyson Happy Pi Day from the Numpugz collection - supporting mental health
@neiltyson Happy Starship launch day too!
@neiltyson First used to measure a round fruit. And thus Apple Pi was computed.