HEAD: Opening Society: A Smartphone App May Warn if You’ve Been Exposed to Coronavirus

Communities in the United States and around the world are talking about when and how to ease lockdown measures as they grapple with the COVID-19 pandemic. This disease and how it spreads presents some unique challenges. People without symptoms can infect others, and for some, it can be deadly. What if a smartphone app could let you know if you have been exposed? Michelle Quinn reports.