Scott Flansburg (born December 28, 1963) is an American man who is often called a mental calculator. Dubbed "The Human Calculator" by Regis Philbin, in 2001 he was entered into the Guinness Book of World Records for speed of mental calculation. He is the annual host and ambassador for World Maths Day, and is a math educator and media personality. Flansburg has published the books Math Magic and Math Magic.
Shakuntala Devi ( 4 November 1929 – 21 April 2013) was an Indian writer and mental calculator, popularly known as the "human computer". A child prodigy, her talent earned her a place in the 1982 edition of The Guinness Book of World Records
Shakuntala Devi was given this title after she demonstrated the calculation of two 13 digit numbers: 7,686,369,774,870 × 2,465,099,745,779 which were picked at random. She answered correctly within 28 seconds
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