The Spanish flu infected an estimated 500 million people worldwide, and killed tens of millions. A century later, we have vaccines, antibiotics, advanced life support, and high-tech monitoring networks. And, yet, disease outbreaks - from Ebola, to Zika, to measles - continue to surprise even experts. Medical historian Mark Honigsbaum has chronicled the outbreaks and epidemics of the twentieth century in his new book, The Pandemic Century: One Hundred Years of Panic, Hysteria, and Hubris . He