A study appearing today in the journal Science reports that the hunter-gatherers seem to be the only group of humans known to have no concept of numbering and counting.
Besides living a numberless life, he reports in a separate study prepared for publication, the Piraha are the only people known to have no distinct words for colours.
They have no written language, and no collective memory going back more than two generations. They don't sleep for more than two hours at a time during the night or day.
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