Excavation works at the cave site Sima de los Huesos.
The discovery of a 1.8 million-year-old skull at Dmanisi in Georgia has revolutionized scientists' idea of human evolution. Paleoanthropologist Donald Johanson of the Institute of Human Origins at Arizona State University joins Jeffrey Brown to discuss what these ancient remains…
Neil Roach explains why humans throw with such high velocities.
Book Examines Varied 'Tapestry' of Michelle Obama's American Ancestry…
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