how to prove your point

     Remember Thor Heyerdahl and the Kon-Tiki?  Thor Heyerdahl posited the theory that people from the South Pacific might once have traveled to South America, or people from South America might have traveled to Polynesia.  Expert scientists, historians, and anthropologists thought Heyerdahl's theory was ludicrous. So Heyerdahl built a boat out of reeds, the same way people might have built a boat hundreds of years ago. Heyerdahl and his crew sailed across the Pacific in the reed boat, called the Kon-Tiki, and the experts had to concede that such a trip was possible.