Here’s another crash course psychology video by Hank Green. In this one he talks about emotion, stress, and health. The part of the video I found most interesting was the discussion about stress. Stress isn’t just an inconvenience, it can actually KILL you. Feelings of sadness and depression can put our health at risk. It can weaken your immune system, making you more prone to attract sickness of some kind. Reactions by our body to stressors can fire up our body’s sympathetic nervous system and trigger our ‘fight or flight’ response. Stress is natural, but too much stress can be unhealthy.