1 new of 83 responses total.
#47 We don't! The Mayans and Olmec were absolutely incredibly advanced. What is not known is if they (and many other early civilizations) were being literal when they recorded being visited by "star people" who taught them amazing things. It could be a very real possibility that the space people were folklore and the civilization developed amazing astronomy and mathematics that exceeded anything that came after until the 19th century in a vacuum. Aborigines, many Native American tribes, Mayans, etc. all have spoken histories of the star people. Who knows if it's been added to?
You have several choices: