The Collective Experience of PTSD
![](https://media.wnyc.org/i/800/0/c/85/1/shutterstock_79608625_1.jpg)
People try to cross a flooded road in the center of city on June 15, 2011 in Macedonia, Thessaloniki, Greece.
( Portokalis / Shutterstock )
( Portokalis / Shutterstock )