Polynesian navigation snow. In the mid-20th century, Thor Heyerdahl proposed a new theory of Polynesian origins (one which did not win general acceptance), arguing that the Polynesians had migrated from South America on balsa-log boats. The presence in the Cook Islands of sweet potato that is a plant native to the Americas (called "kūmara" in Māori), which have been radiocarbon-dated to 1000 CE, has been cited as evidence that Americans could have traveled to Oceania. The current thinking is that sweet potato was brought to central Polynesia circa 700 CE and spread across Polynesia from there, possibly by Polynesians who had traveled
Kon-Tiki (2012 film) One significant inaccuracy is absence of indigenous Polynesians from the cast. The scenes depicting Heyerdahl's experiences on Fatu Hiva were shot in Thailand with Thai extras who do not resemble native Polynesians, and who are shown holding compound spears not typical of the Marquesas Islands, and weaving rattan baskets, of which neither the technique nor the plant material are native to French Polynesia. The film focuses on Heyerdahl's theory that Polynesia was first populated with humans from Peru, but it ignores the Norwegian's more ethnocentric speculations that the original Kon-Tiki voyage was undertaken by a race of tall white bearded