A pair of Japanese and Us computer scientists currently holds the record for calculating the most digits of pi, they came up to five TRILLION decimal places. In 2010, Shigeru Kondo and Alexander Yee eclipsed the previous record of 2.7 trillion places. The pair used a desktop computer with 20 external hard disks that cost 18000 dollars and took them 90 days to make the calculation.
It is interesting that they would spend so much money just to find digits that barely have any impact on the solution at all. This is very interesting.
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