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Most ancient human DNA is gathered from bones or teeth. Since the human fossil record is very limited, scientists have been exploring new sources for DNA. They found successful human DNA samples from dust on a cave floor. The samples are tiny. They can be hard to tell if they came from human bone or something else. Still, scientists continue working to develop methods that make it easy to be certain DNA is from a human.

Read more about finding human DNA in cave floor dirt.

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