π is known to 5 trillion decimal places. 39 is enough to calculate the size of the universe to the radius of 1 atom.
Japanese systems engineer Shigeru Kondo and Alexander Yee, a US computer science student, set about calculating the constant to more decimal places than anyone else using only a home computer.
It took 90 days to calculate pi at Kondo's home using a desktop computer with 20 external hard disks. It ran on the operating system Windows Server 2008R2 and used powerful Intel microprocessors. Verification took 64 hours.
By the time you read this, someone will probably have calculated even more digits.
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