Polynesian navigation snow. In the mid-20th century, Thor Heyerdahl proposed a new theory of Polynesian origins (one which did not win general acceptance), arguing that the Polynesians had migrated from South America on balsa-log boats. The presence in the Cook Islands of sweet potato that is a plant native to the Americas (called "kūmara" in Māori), which have been radiocarbon-dated to 1000 CE, has been cited as evidence that Americans could have traveled to Oceania. The current thinking is that sweet potato was brought to central Polynesia circa 700 CE and spread across Polynesia from there, possibly by Polynesians who had traveled
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