The fastest human calculator has broken his own mental arithmetic world record. Alexis Lemaire used brain power alone to work out the answer to the 13th root of a random 200-digit number in 70.2 seconds at London's Science Museum.
The 27-year-old student correctly calculated an answer of 2,407,899,893,032,210, beating his record of 72.4 seconds, set in 2004.
The so-called 'mathlete' used a computer package to randomly generate a number before typing in the answer.
(photo : Mr Lemaire set an earlier record in 2004)
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