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 (2012 film) have been utilized 1,500 years ago by the indigenous peoples of the region. Though he himself cannot swim or sail, he sets out on the treacherous 4,300 nautical mile–journey across the Pacific from Peru to Polynesia aboard the small raft, along with his crew of five men (and a macaw named Lorita). During the three months aboard the primitive vessel named after Inca god of sun and storm, Kon-Tiki, the crew's scientific reenactment of the legendary voyage from the coast of Peru to the Polynesian islands is met with setbacks in the form of storms, sharks, and other perils of