Arroyo del Vizcaíno, in southern Uruguay, might be the most important place on Earth

[youtube=http://www.youtube.com/watch?v=PqZrjRLd_eY&w=600&h=315]

Let's begin by tracing the argument: for a good long time, the belief of the scientific/paleontology/anthropology community was that the first people to begin arriving in America were "the Clovis People."  They seemed to appear about 13,500 to 13,000 years ago, and the idea held that they c…