With some historians estimating it's going to wipe out almost 60% of the entire European population. Total death tallies go upwards of 100 million people. I'm telling you, it's not so great. Alright guys, let's see if we can do a little bit of the giddy up for the learning as we go ahead and get her done right now. Yersinia's pestis. It was Yersinia's pestis in the kitchen with a knife. It's that bacteria that is the cause of plague.