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 sea. A book documenting the voyage and raft was released in 1948 by Thor Heyerdahl, called "". A film documentary about the voyage and raft was released in 1950, called "Kon-Tiki". It won the 1951 Oscar for Best Documentary Feature. "Kon-Tiki" is a 2012 Norwegian historical dramatized feature film about the 1947 "Kon-Tiki" expedition. It stars Pål Sverre Valheim Hagen as Thor Heyerdahl and is directed by Joachim Rønning and Espen Sandberg. It was the highest-grossing film of 2012 in Norway and the country's most expensive production to date. Kon-Tiki expedition The "Kon-Tiki" expedition was a 1947 journey by raft