Measuring Coastline

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...

Why is it problematic to measure the length of coastline?

Featuring Steve Mould: https://twitter.com/MouldS

With thanks to the Ordnance Survey: http://www.ordnancesurvey.co.uk