These concepts are important in various ways. Especially interesting is their contribution to our understanding of sickness among the Pirahãs. I learned this early on when Kóhoibiíihíai and I were talking about his daughter, Xíbií. I was trying to explain to him why she had malaria. I was starting to talk about mosquitoes and blood. “No, no,” Kóhoi stopped me in midsentence. “Xíbií is sick because she stepped on a leaf.” “What? I stepped on a leaf. I’m not sick,” I answered, puzzled by his account of Xíbií’s malaria. “A leaf from above,” he said, increasing the enigma for me. “What leaf from
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