SAO RAIMUNDO NONATO, BRAZIL - FEBRUARY 01, 2014: Ni&egrave;de Guidon, head archaeologist of the Serra da Capivara, national park, sits in her home on February 01, 2014 in Sao Raimundo Nonato, Piaui province, in Northern Eastern Brazil.  Ni&egrave;de Guidon is the head archaeologist at the Serra da Capivara National Park in Piau&iacute;, Brazil where she and her colleagues have discovered over 800 pre-historic sites concerned with the occupation of America by human beings.<br /> <br /> Daniel Berehulak for The New York Times
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