This is very interesting @jansher. I didn't know serotonin development was from sunlight improving. I knew the sun was good for mental health but didn't know why! I thought that the hot weather and mental aggression was particularly interesting. I never realized that but now that I think about it, it seems true.

The suicide rate thing in May is interesting...I don't know correlation implies causation though because based on that theory, if it's hotter in the summer, shouldn't there be more suicides then?