There are already several methods of identifying cattle –
branding, ear tags, tattooing and ear notching all come to mind. Now,
however, Egyptian scientists are working on a new biometric system that's less
invasive and more difficult to thwart: electronic muzzle-printing.
Do you remember Pig-Pen, the Peanuts comic character who's always surrounded by a cloud of his own filth? Well, it turns out that we're actually all a little like him. 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.