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"π has fascinated mathematicians, engineers and other people for centuries. It is a mathematical constant that is the ratio of a circle's circumference (C) to its diameter (d); This also explains why and how this number got its name: the lowercase π was first adopted in 1706 as an abbreviation for this number because it is the first letter of the Greek for "perimeter", specifically of a circle." Introduces a video by Numberphile explaining more about the determination of π

Pleased with the #MathMaths History Tour video # 2. Look out for it alongside # 1 & the π slide interlude at http://bit.ly/mathmathshistory - Peter Rowlett (peterrowlett) http://twitter.com/peterrowlett/status/49785133376606209

"An average person can read out approximately 120 digits/min. Keeping this pace it would take more than 158,000 years to recite the 10 trillion digits of π discovered this year and roughly 3 weeks to read out the 4 million digits visualized here."