A study reported in Science Daily conducted by a professor from my alma mater, Vanderbilt, finds that were people in South America more than 12,000 years ago.
The Anthropology Department at Vandy specializes in Meso-America.
Professor Dillehay wrote the piece and it appears in the Journal Science.
This underscores the provisional nature of science. New stuff is learned every day allowing us to modify our theories.