Scientists have discovered that not only does everyone emit an invisible “microbial cloud,” but that individuals can be recognized by the bacteria that make up their particular cloud.

 

A team from the University of Oregon placed 11 test subjects in a sanitized chamber, one at a time, then analyzed the airborne microbes that each person left behind. It was found that within four hours, it was possible to identify most of the subjects by comparing their residual “microbial cloud signature” with a fresh one obtained directly from them.
via Gizmag