Behavior: Beastly or Manly?

Anthropologist Napoleon Chagnon's first view of the Yãnomamõ Indians was partially obscured by a number of drawn arrows aimed at his face. The archers had huge wads of green tobacco jammed between their teeth and lower lips. Long streams of green mucus hung from their noses—the normal flow from a hallucinogenic drug that makes the normally aggressive Yãnomamõ even more touchy and menacing.

Though the Indians decided to spare Chagnon, who was then 24 and working on a Ph.D. at the University of Michigan, he immediately lost all illusions about noble savages.

That was...

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