Who Was First?

Stone tools found at a rock shelter in Brazil may date to 20,000 years ago, suggesting that humans were in South America before North America's Clovis people. The Clovis hunters are generally thought to have been the first to settle in this hemisphere: http://www.sciencenews.org/view/generic/id/348953/description/Disputed_finds_put_humans_in_South_America_22000_years_ago