Science is about building explanations from evidence.  Here is a great example of multiple explanations for one set of 30,000 year old DNA…

"In a cave in Siberia, scientists have found a 40,000-year old pinky bone that could belong to an entirely new species of hominid. Or it may be yet another example of how hard it is to figure where one species stops and another begins–even when one of those species is our own. Big news, perhaps, or ambiguous news.

http://blogs.discovermagazine.com/loom/2010/03/24/the-x-womans-fingerbone/

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