Pi Day, 圓周率日

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A number of things to know about Pi - CNN.com
http://edition.cnn.com/2015/03/13/living/pi-day-things-to-know-feat/

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Pi Day - North Bank Now http://www.northbanknow.com/2015/03/pi-day/

Take JPL Education's Pi Day challenge featuring real-world questions about NASA spacecraft -- then tweet your answers to @NASAJPL_Edu using the hashtag #PiDay. Answers will be revealed on March 16. Image credit: NASA/JPL-Caltech
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JPL | News | On Pi Day, How Scientists Use This Number
http://www.jpl.nasa.gov/news/news.php?feature=4508

Pi Day - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Pi_Day
圓周率日 - 維基百科，自由的百科全書
http://zh.wikipedia.org/wiki/%E5%9C%93%E5%91%A8%E7%8E%87%E6%97%A5

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