Human DNA Includes Viruses That Couldn't Take Us Down

And that’s not even including all the alien DNA:

It turns out that about 8 percent of the human genome is made up of viruses that once attacked our ancestors. The viruses lost. What remains are the molecular equivalents of mounted trophies, insects preserved in genomic amber, DNA fossils. [In Our Genes, Old Fossils Take On New Roles]


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