The Black Death
This is it, the king daddy of pandemics in human history, the absolute deadliest thing we've known to hit mankind - the Black Death. Now, I know what you're thinking; why does the death have to be black? Well, it doesn't especially; at the time, it was alternately referred to as the "blue sickness," the Pestilence, the Great Pestilence and the Great Mortality, although even those last two names seem pretty insensitive when you consider that it probably wasn't so great for the people living (and dying) through it. About 800 years after its last major appearance in the Plague of Justinian (longer than it's been for us since the Black Death itself), the bacteria Yersinia pestis hitched another ride out of its origins in Asia inside the bellies of fleas riding on rats. Fleas are jerks, but they didn't like the plague any more than humans did, since it was killing them too, building up in their guts and blocking the blood they drink from getting far ...