The latest number-crunching champ isn't a supercomputer--it's a hacked-together PC.
Shigeru Kondo of Iida, Nagano Prefecture, worked with software designed by Northwestern University grad student Alexander Yee, and followed up their 2010 feat of reckoning pi to 5 trillion digits.
The result was achieved earlier this month after 371 days of computation and numerous hard drive failures.
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