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
Erik Hesselberg Hamburg, Germany. He stayed in Germany when World War II began, so he could not return to Norway and started working as a decorator in Braunschweig. In 1945, he and his German-born wife, Liselotte (Liss) Güldner, relocated to Lillehammer, Norway. In 1947, Hesselberg lived in the village of Borre and worked as a painter. Thor Heyerdahl approached him and invited to become a navigator on the Kon-Tiki expedition. During the trip, he worked as an astronavigator and cartographer as he was the only professional sailor. He painted the large Kon-Tiki figure on the raft's main sail. Also, he drew sketches,