Searching for answers is a young anthropologist named Genevieve von Petzinger, who is compiling a one-of-a-kind database at the Universityof Victoria in British Columbia, Canada.
Writing in Evolution and Human Behaviour Victoria Reyes-Garcia, of the Autonomous Universityof Barcelona, and her colleagues describe a study they carried out on the Tsimane', a group of Amerindians who live in Bolivia's slice of the Amazonian rainforest.