Calculator Unboxing #5 (Little Professor)

Alex Bellos discusses how the Incans used knots in string (Quipu) to record numbers.Check out Brilliant (get 20% off their premium service): https://brillian...

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We're back with another unboxing by Matt Parker.

James Grime discusses the same device: http://youtu.be/9TAlEVDvXgw
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