A new model shows the average minimum number of relationships that need to be maintained by individuals to form cooperative groups.
Cannibalism is one of our biggest taboos, with good reason. For starters, it's gross, and for other starters, it's a fast track to some gnarly diseases. However, that's not to say early man didn't eat, er, other early men.
An isolated tribe living in the Amazon rainforest will soon be contacted by the Peruvian government for their own safety.Isolated Amazon Tribe
For many years, indigenous tribes in remote regions of Ecuador struggled to get access to vital medical care. But a single mobile surgical unit is changing all of that.
The Shipibo Indians, of Peru, perform a ritual that connects them more closely to shapes and patterns that later manifest in their work: the consumption of ayahuasca, a powerful plant hallucinogen.
An apparent missionary and other outsiders are shown giving clothes and other gifts to children from an isolated indigenous tribe.
The petite Dorset people went extinct before the Vikings arrived and never mixed with Inuit or Eskimo peoples.
Pushed out of their home territory by violence, a second wave of people who had been living in voluntary isolation in the Amazon rainforest has made contact with villagers in Brazil.
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