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
Torgeir Sæverud Higraff Torgeir Sæverud Higraff Torgeir Sæverud Higraff is an explorer, teacher and author with special interest in prehistoric transoceanic contact. Like Thor Heyerdahl, Higraff combines history, anthropology and traditional knowledge with expeditions. In 2002, the year Heyerdahl died, Higraff decided to recreate the Kon-Tiki expedition, and in 2006 the Tangaroa Expedition sailed from Peru to Raiatea in eastern Polynesia. Tangaroa outperformed Kon-Tiki by using an improved sail rig and active use of the guara centerboards. In 2014, Higraff proposed another expedition: to sail roundtrip from Peru to Easter Island. The Kon-Tiki2 expedition built two rafts in Callao in 2015 and reached