On the frontlines of the hunt for killer viruses, a shocking discovery is made. Viruses, once thought to be a menace to humankind, may in fact be the ultimate creators. Since the beginning of time they have played a critical role in evolution, shaping us, perhaps even creating us. How could that be? How can an entity seemingly programmed for destruction lead to genetic diversity and new species? Answers are locked in an ancient code hidden deep inside our bodies. Recently it was discovered that much of the broken shards and chunks of our DNA, once thought to be ?junk?, are actually remnant viruses. By deciphering their codes, scientists are beginning to write a new chapter in our understanding of human evolution.