Remember Black Death? You know, the medieval plague that swept across Europe and killed off about half of that continent's population? Well, it's back ... at least in genetic form thanks to science:

The genetic code of the germ that caused the Black Death has been reconstructed by scientists for the first time.

The researchers extracted DNA fragments of the ancient bacterium from the teeth of medieval corpses found in London.

They say the pathogen is the ancestor of all modern plagues.

I mean, what could go wrong? Link