Contagion in popular places: From Zika to political extremism

The alert is out and South Floridians are taking heed. With the Centers for Disease Control and Prevention issuing a warning for visitors and locals to avoid a neighborhood in Miami after more than a dozen individuals contracted Zika, a new study shows how the flow of visitors through a popular place, such as the affected Wynwood area of Miami, determines the eventual severity and duration of such an outbreak.