Question about the 50,000 year old fossils in America?

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hear many people using 50000 year old fossil discoveries in america current native americans have been here since before 50000 years.
http://www.sciencedaily.com/releases/200...

question: how people know these artifacts , fossils of current natives? have been of different type of people arrived in america earlier.

i hear many people using 50000 year old fossil discoveries in america current native americans have been here since before 50000 years. http://www.sciencedaily.com/releases/2004/11/041118104010.htm question: how people know these artifacts , fossils of the...


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