Next time you’re about to toss a cigarette butt on the ground, consider this freaky fact: It takes less than a nanogram (or less than one billionth of the mass of a penny) of your dried saliva for scientists to construct a digital portrait that bears an uncanny resemblance to your very own face. For proof look to Hong Kong, where a recent ad campaign takes advantage of phenotyping, the prediction of physical appearance based on bits of DNA, to publicly shame people who have littered.
via Wired
Images courtesy of Ogilvy
