8% of our genome may be viruses that decided to live with us: http://en.wikipedia.org/wiki/Endogenous_retrovirus?#Human_endogenous_retroviruses http://en.wikip

8% of our genome may be viruses that decided to live with us: http://en.wikipedia.org/wiki/Endogenous_retrovirus?#Human_endogenous_retroviruses http://en.wikipedia.org/wiki/Endogenous_retrovirus?#Human_en...