They don't count and they have no number words
A small group of hunter/gatherers living in the Amazon rain forest is overturning some fundamental assumptions about the mind. Although linguists have long believed that counting and having words for numbers are basic, if not innate, to human cognition, the Pirahã people in Brazil have no words to express numerical concepts such as “one,” “two,” or “many.” “They don’t count and they have no number words,” says MIT cognitive scientist Edward Gibson, who headed a study published in the journal Cognition [pdf]. (via Discover)
