These days, all you need to do is fill a tube with spit and mail it off to find out all about your ancestors, and even about your risks for certain diseases. Loads of DNA sequencing and typing companies exist to tell you all about yourself. But how accurate are they? And how safe is that information? We'll speak with science writer Tina Hesman Saey about her big project sending off her spit to more companies than she can count. For science, of course. Then, we'll take out ethical concerns to bioethicist Kelly Hills, to talk about the potential pitfalls of the DNA revolution.