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
Kon-Tiki (Scouting) Challenge", "Spare Time Activities", "Dress-up competition" and others. The 2015 theme was "Here be Dragons". Kon-Tiki events have also been held in Port Elizabeth in the Eastern Cape. In 2012, Scouts Australia (SA Branch) ran the first Kon-tiki Raft Challenge outside South Africa. The competition was based on that of the South Africans. Kon-Tiki (Scouting) Kon-Tiki refers to Scout and Guide raft-building competitions held by Scouts South Africa and Scouts Australia. Named after Thor Heyerdahl's Kon-Tiki expedition of 1947, teams of Scouts and Guides age 11 to 17 compete to build and live on a raft for a weekend. Support