As an example, I recall how a colleague of mine was surprised by the adult treatment of Pirahã children. Peter Gordon, a psychologist at Columbia University, and I were in a Pirahã village together in 1990 interviewing a man about the spirit world. While we were talking we had set up a video camera to record our interactions with the people. That evening as we watched bits of the video, we noticed that a toddler about two years old was sitting in the hut behind the man we were interviewing. The child was playing with a sharp kitchen knife, about nine inches in length. He was swinging the knife
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