The tragic 2013-2015 Ebola outbreak in west Africa shocked the world. In this episode of Think Like a Scientist, computational genetiicist Pardis Sabeti and disease ecologist Lina Moses bring us to the front line of the epidemic and explain the science behind how this event became the largest ebola outbreak in history. This film was produced by Day's Edge Productions for HHMI BioInteractive and Nautilus Magazine. Check out the full story here: autil.us/issue/41/selection/natural-selection-in-an-outbreak