How Much Worry about Mass Shootings Is Too Much?

Study suggests the reason we worry is to avoid negative emotional contrasts after negative events. In other words, if we are already worried and anxious, we will experience less of a negative emotional contrast after something bad happens than if we were feeling happy and relaxed initially.

Bird flu can jump to mammals. Should we worry?

4 big asteroids are flying by Earth this week, but don't worry. They aren't getting too close.