Calculator Unboxing #6 (Staples collection)
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...
Three calculators from Staples receive our forensic examination.
More unboxings: http://bit.ly/CalcUnbox
Featuring Matt Parker: http://standupmaths.com/
