ancient history and anthropology. He also showed that long-distance ocean voyages were possible with ancient designs. As such, he was a major practitioner of experimental archaeology. The Kon-Tiki Museum on the Bygdøy peninsula in Oslo, Norway houses vessels and maps from the Kon-Tiki expedition, as well as a library with about 8,000 books. The Thor Heyerdahl Institute was established in 2000. Heyerdahl himself agreed to the founding of the institute and it aims to promote and continue to develop Heyerdahl's ideas and principles. The institute is located in Heyerdahl's birth town of Larvik, Norway. In Larvik, the birthplace of Heyerdahl, the municipality began a project in 2007 to attract more visitors. Since then, they have purchased and renovated Heyerdahl's childhood home, arranged a yearly raft regatta in his honour at the end of summer and begun to develop a Heyerdahl centre. Heyerdahl's grandson, Olav Heyerdahl, retraced his grandfather's Kon-Tiki voyage in 2006 as part of a six-member crew. The voyage, organised by Torgeir Higraff and called the Tangaroa Expedition, was intended as a tribute to Heyerdahl, an effort to better understand navigation via centreboards ("guara") as well as a means to monitor the Pacific Ocean's environment. A book about the Tangaroa Expedition by Torgeir Higraff was published in 2007. The book has numerous photos from the Kon-Tiki voyage 60 years earlier and is illustrated with photographs by Tangaroa crew member Anders Berg (Oslo: Bazar Forlag, 2007). "Tangaroa Expedition" has also been produced as a documentary DVD in English, Norwegian, Swedish and Spanish. Paul Theroux, in his book The Happy Isles of Oceania, criticises Heyerdahl for trying to link the culture of Polynesian islands with the Peruvian culture. Recent scientific investigation that compares the DNA of some of the Polynesian islands with natives from Peru suggests that there is some merit to Heyerdahl's ideas and that while Polynesia was colonised from Asia, some contact with South America also existed; several papers have in the last few years confirmed with genetic data some form of contacts with Easter Island. More recently, some researchers published research confirming a wider impact on genetic and cultural elements in Polynesia due to South American contacts. Decorations and honorary degrees Asteroid 2473 Heyerdahl is named after him, as are HNoMS Thor Heyerdahl, a Norwegian Nansen class frigate, along with MS Thor Heyerdahl (now renamed MS Vana Tallinn), and Thor Heyerdahl, a German three-masted sail training vessel originally