You can't do the math without the words: Amazonian tribe lacks words for numbers | Anthropology and Archaeology | Scoop.it
"The Piraha is a really fascinating group because they are really only one or two groups in the world that are totally anumeric," says Everett, assistant professor in the Department of Anthropology at the UM College of Arts and Sciences.

Via Szymon Trusewicz, JKingston