If I were to tell you that the single most deadly event in recorded human history took place in the 1900’s, what would you think it was? Probably one of the Great Wars – which would be close, but not quite right. The event took place from 1918 to 1919, but the killer was no human; the weapon neither bullets or gas. It was an enemy so small it cannot be seen by the naked eye: the 1918 Spanish Influenza virus, also known as “La Grippe.” During its year-long reign, this tiny virus killed between 50 and 100 million people across the globe. It killed more people in a single year than the Black Death did in the entire 14th century, more than either World War, and well over 6 times the population of New York City. Some even say that more Americans were buried in France having died of influenza than had been killed fighting on the battlefield. We get outbreaks of the flu every year without batting an eyelash, so what went so terribly wrong in 1918?