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https://youtu.be/rEKeXaCa3pc A remote region of Brazil's northeastern countryside offers clues to how  mankind arrived in the Americas. Archeologists doing research there  since the 1970s say there's vast evidence the first peoples came to  South America much earlier than previously thought. The evidence coming  from art left on rocks and caves. CGTN's Paulo Cabral has more. https://america.cgtn.com/2019/09/13/art-on-brazilian-rocks-tell-history-of-mankind