This photo provided by the journal Nature shows human upper teeth found in the Fuyan Cave of Hunan province in southern China. They are among dozens of fossil human teeth more than 80,000 years old that were recovered from the cave, providing the oldest clear indication by far that people lived in southern Asia that long ago. Maria Martinon-Torres, of University College London in England, and colleagues report the discovery in a paper released by the journal Nature on Wednesday, Oct. 14, 2015. (S. Xing/Nature via AP) Photo: S. Xing