© 2006, 2000 WGBH Educational Foundation. All rights reserved.
Adapted from NOVA: "Mystery of the First Americans." A NOVA Production by MDTV Productions for WGBH/Boston. Illustrations courtesy of Greg Harlin - Wood Ronsaville Harlin, Inc. Still images courtesy of Kenneth Garrett/National Geographic Image Collection, Setor de Anthropologia Biológica, Museu Nacional/UFRJ Brazil. Animation courtesy of Schwartz/Giunta Production Company.