8 percent of your DNA isn't human— it's viral DNA.
DNA is a fragile molecule and isn't immune to error. There are many repair mechanisms, but some of the damage stays with you for life. For example, a virus can add its DNA to your own and could be inherited by your children. Over countless generations, the human race has accumulated so much viral DNA that it makes up 8 percent of all our DNA. Fortunately, most are harmless and some have even proven to be helpful.

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Science And Wonders
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