chewed gum, clipped fingernails, believe it or not, all these things hold a gold mine of your genetic secrets. things like your sex, hair color, eye color and even ancestry. pretty cool, say, for solving mysteries but take a look at this. using strands of hair and garbage she find on the street, one art aest in new york is making 3d models of people s faces. people that she s never met and people she s never seen. the science behind these life-size portraits. so far from perfect, but it s sort of creepy a and amazing and inkre she is an information artist. good way to describe heather. she joins me now live in new york. heather, thanks so much for