Germany Today
Mental Wizardry
Gert Mittring has broken world records for mental calculation no less than nine times. He's faster than a calculator, figuring out square roots of huge numbers in the blink of eye. Doing sums, he says, relaxes him.
- Date 16.04.2013
- Duration 03:14 mins.
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- Permalink https://p.dw.com/p/18GNd
