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Pi is famously calculated to trillions of digits - but Dr James Grime says 39 is probably enough.
More links & stuff in full description below ↓↓↓
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."
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