Dig into the history of pandemics to learn how viruses and disease spreads and what we can do to stop future outbreaks.br br --br br In our increasingly globalized world, a single infected person can board a plane and spread a virus across continents. Mark Honigsbaum describes the history of pandemics and how that knowledge can help halt future outbreaks. br br Lesson by Mark Honigsbaum, directed by Patrick Blower.