There is still no adequate (0) EXPLANATION (EXPLAIN) why, several thousand years ago, cultures in both Egypt and South America saw the 1INTRODUCE of pyramids. Was it coincidence? Many 2SCIENCE believe that it was, and state that there is no 3POSSIBLE at all that people from two distant continents traded information on 4BUILD techniques. However, some 5REVOLUTION theories in recent years, based on the 6DISCOVER that the two cultures also share key myths, legends and beliefs, suggest that the 7APPEAR of pyramids on opposite sides of the world was no coincidence at all. One 8RESEARCH working on this, Crystal Davis, said: 'The importance of finding out the truth here cannot be exaggerated. It could change our whole understanding of the history of the world.'