Interesting, I hadn't known there was civilization this early in the Americas. So the city had 3000 people or so, their "nation" about 20,000. And they lived peacefully for six centuries. And then abandoned their cities. Wild.

Some scholars think quipus were also navigational aids. Ancient sailors crossed the Pacific with ''star maps'' made of knotted cord. We never give ancient people enough credit! If only more funding were available for archaeology.....the '''new world'' (very Eurocentric term) is ''hot'' right now, since lidar's uncovered so many ruins in the Maya regions.