Submitted: Apr 6, 2008 - Twenty-five million people died in the Black Death. How did this horrific disease spread and how did people react to a killer they could not possibly comprehend?

The symptoms of the Black Death were gruesome: Tumors covered the body -- some of them as big as an egg or apple, Boccaccio wrote. A large neck tumor might permanently cock a person's head in the opposite direction. Purplish splotches…