400 and Gamebooks

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...

James Clewett graphs one of his favourite books and explains the significance of 400.

The extra video about the weird bit of graph is at http://youtu.be/wYo0SOMlxuc

The book is The Warlock of Firetop Mountain, the first in the Fighting Fantasy series. The same principle applies to the likes of "Choose Your Own Adventure" books.

James Clewett tweets (occasionally) at https://twitter.com/_Itch_

More videos featuring James: http://www.youtube.com/playlist?list=PLeaKaAcimVK3tyCR6ugbA4Yx7eaP0MIoX