Japanese businessman, Shigeru Kondo, with his home-built computer calculate the ever growing value of 'Pi', the ratio of a circle's circumference to its diameter, to five trillion digits, almost doubling the accuracy of the previous world record.
His calculation was recognized by Guinness World Records with a certificate mailed to him.
Using parts from local warehouses and online stores, Kondo assembled a desktop computer that featured two high-end Intel processors and 20 external hard-drives.
After 90 days of non-stop processing, Kondo obtained a string of five trillion numbers that defined pi. He verified the result with different methods, which alone took 64 hours.
The previous record, set by a French software consultant in January 2010, was around 2.7 trillion digits.
Now, Mr. Kondo wants it to take to to 10 trillion digits.