How would you say that you are human? if you answered 100 percent (if you bothered to respond at all), you are unfortunately incorrect. While nearly 0 percent of your DNA is made of human material, a small percentage of it is considered "foreign."
Yes, you are foreign party, but not the kind you think. Sorry, Martian.
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About 8 percent of all human DNA is made up of ancient viral fragments that lurk in the depths of the genome.
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Viruses are made RNA (considered a precursor of DNA, which is more complex). They work to infect their hosts in their injecting DNA-based replicas of their own RNA.
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A recent study Proceedings of the National Academy of Sciences revealed 19 new pieces of viral DNA into the human genome.
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(via IFL science)
now that is the kind of creepiness I can get down with. The human body is home to so great madness.

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