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
Knut Haugland He held the ranks of major from 1954 and lieutenant colonel from 1977. He left the Air Force in 1963 to become acting, later permanent, director of the Norway's Resistance Museum. He retired from this position in 1983. He was also the director of the Kon-Tiki Museum from its start in 1947 to 1990. He rounded off his career as board chairman of the Kon-Tiki Museum in 1991. Haugland also served as J. S. Wilson's attaché at the 1949 12th World Scout Conference in Elvesæter. Five of the six men in the Kon-Tiki expedition were Scouts. Haugland first met Thor