Polynesia of the plant in the Cook Islands have been radiocarbon-dated to 1000, and current thinking is that it was brought to central Polynesia c. 700 and spread across Polynesia from there, possibly by Polynesians who had traveled to South America and back. Thor Heyerdahl proposed in the mid-20th century that the Polynesians had migrated from the northwest coast of Canada by large whale-hunting dugouts, and from South America on balsa-log boats. Many anthropologists have criticised Heyerdahl's theory, including Wade Davis in his book "The Wayfinders". Davis says that Heyerdahl "ignored the overwhelming body of linguistic, ethnographic, and ethnobotanical evidence, augmented
Kon-Tiki expedition Kon-Tiki expedition The "Kon-Tiki" expedition was a 1947 journey by raft across the Pacific Ocean from South America to the Polynesian islands, led by Norwegian explorer and writer Thor Heyerdahl. The raft was named "Kon-Tiki" after the Inca sun god, Viracocha, for whom "Kon-Tiki" was said to be an old name. "" is also the name of Heyerdahl's book; the Academy Award-winning documentary film chronicling his adventures; and the 2012 dramatized feature film nominated for the Academy Award for Best Foreign Language Film. Heyerdahl believed that people from South America could have settled Polynesia in pre-Columbian times. His aim in