Between 2013 and 2016, the Ebola virus swept through West Africa, killing more than 11,000 people and infecting nearly 30,000 in all. The problems were numerous, but the question remained; where had this virus come from? Ebola had never been seen in West Africa before. The collective scientific community had some ideas, though no wildlife reservoir for the virus had been definitively determined. And it is through knowing the source of an outbreak that we can prevent similar ones in the future. For example, before we had any understanding of germs, people believed that disease was spread by bad-smelling winds called “miasmas.” Thusly, medieval customs to prevent spread of plague were predicated on avoiding these bad airs (as in the “pocket full of posies” from the nursery rhyme).