Pi is excellently calculated to trillion of fingerbreadth — but how many of them do we really , really need ? This video show that , actually , just 39 will do .
train principal investigator to 39 fingerbreadth allows you to measure the circumference of the observable universe to within the breadth of a single H atom . Sure , you could employ more , but it ’s not really worth the effort , and that means that on a day - to - Clarence Day basis , you could ignore far more of them . [ YouTube ]
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