As you go though your day, you probably don't realize just how much DNA you dispense with. Maybe a strand of hair, a used soda can, or fingernail clipping (eww). In Ms Dewey-Hagborg case she seems to have a penchant for cigarette butts and used gum (double eww). She uses software extrapolates basic information ethnicity and other pointed to create a 3D mask of the individual. It the software 100% accurate - no. It;s still experimental, but it is one heck of a start and brings up some very interesting questions.