But later on the plague is going to be back. It's going to be back in the mid 19th century to the early 20th century in China and India killing upwards of 12 million people. And there's even spotty outbreaks to this day, normally in the Sub-Saharan African region. And normally if we get hold of these people we can cure them. But now let's focus on why did this happen? How did the little bacteria, the little flea, the little rat get all the way to London? So how did the Black Death start, the great plague, the great mortality?