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
Thor Heyerdahl Upper Secondary School national upper secondary courses of study or programmes, only agriculture is instead taught at another upper secondary school, "Melsom videregående skole" in Stokke. The school building covers an area square and has of instructional space, including 320 classrooms, of workshops, a six-hall arena space seating 4,000, three auditoria seating 45–180 people, and a professional kitchen. The library is named Fatu Hiva after the Polynesian island on which Thor Heyerdahl spent his honeymoon in the 1930s. 11% of Thor Heyerdahl Upper Secondary School students speak a language other than Norwegian at home. The school is a focus school for the "Nasjonalt