This amazingly sturdy boat held more than 20 of us as we visited a few of the Uros Islands.The construction of these boats is remarkably similar to reed boats once used on the Nile river in Egypt.In the 1940's, Norwegian scientist Thor Heyerdahl developed a theory that there was some sort of cultural exchange between Africa and South America, and he build a series of boats to test his theory. In 1970, Thor and his crew sailed a reed boat from Morocco to Central America, carrying no supplies, but living off the sea as they went, proving that the journey was possible at least.