An artist travels around New York City collecting hairs, fingernails, discarded paper cups, gum, cigarette butts, and other trash; then extracts the DNA and uses a computer program to construct a face...

An artist travels around New York City collecting hairs, fingernails, discarded paper cups, gum, cigarette butts, and other trash; then extracts the DNA and uses a computer program to construct a face from the genetic information. The artist then prints the results in three dimensions, producing a sculpture that she displays in a gallery along with the original DNA-bearing evidence. The algorithm considers 50 inherited traits that affect facial features, including information on ancestry. What would you do if you wandered into a gallery and found a sculpture of yourself or someone you know? How private is the DNA on a wad of discarded chewing gum?