When it comes to compassion, a photograph of a single suffering person can draw a gut reaction to help. When the numbers of people suffering keep rising, however, such as the death count in Syria's long civil war, the "arithmetic of compassion" kicks in, says UO psychologist Paul Slovic. One plus one no longer adds up to two. Slovic will address that issue and provide a path to help us step through the psychological minefield of doubt that clouds our desire to try to make a difference when a crisis becomes seemingly too overwhelming.