Norwegian athropologist and explorer Thor Heyerdahl (1914 – 2002) climbs the mast of the Kon-Tiki, a vessel made of balsa wood and modeled after prehistoric South American ships, mid 1947. Heyerdahl built the boat and sailed it from Peru to Polynesia in 101 days, thus demonstrating that trips the that magnitude were within the realm of possibility for prehistoric peoples. (Photo by Archive Photos/Getty Images)
