Willy Wortel
Willem Klein (4 December 1912 – 1 August 1986), also known as Wim Klein or under his stage names Pascal and Willy Wortel, was a Dutch mental calculator, famous for ability to perform very complicated calculations in his head very fast. On 27 August 1976, he calculated the 73rd root of a 500-digit number in 2 minutes and 43 seconds. This feat was recorded by the Guinness Book of Records.
In 1986, Klein was killed with a knife attack within his home in Amsterdam. A suspect was arrested, but he was released due to insufficient evidence. Klein's murder remains unsolved.
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