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  • Pi and the size of the Universe – Numberphile

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    Pi is famously calculated to trillions of digits – but Dr James Grime says 39 is probably enough. All our Pi videos: http://bit.ly/W4oDN1

    An extra note from Dr Grime: “Since pi39 ends in 0, you may think we could use pi38 instead – which has even fewer digits. Unfortunately, the rounding errors of pi38 are ten times larger than the rounding errors of pi39 – more than a hyrdogen atom. So that extra decimal place makes a difference, even if it’s 0.”

    Website: http://www.numberphile.com/
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    Videos by Brady Haran

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