Cool! I also was amazed when I first learned that the human genome contains an archeology of ancient viruses whose DNA we incorporated over the millennia. http

Cool! I also was amazed when I first learned that the human genome contains an archeology of ancient viruses whose DNA we incorporated over the millennia. http://en.wikipedia.org/wiki/Endogenous_retrovirus http://en.wikipedia.org/wiki/Endogenous_retrovirus