The Amazonian tribe that can only count up to five

From , with thanks to muriel:

Alex Bellos, The Amazonian tribe that can only count up to five.

Does a group of indigenous South Americans hold the key to our relationship with maths? Here, an extract from an enlightening new book [Alex’s Adventures in Numberland, by Alex Bellos. 448pp, Bloomsbury Publishing PLC, £17.9] explains why it just might.