Creating Passionate Users: Angry/negative people can be bad for your brain: "A few things I'll try to explain in this post:
1) One of the most important recent neuroscience discoveries--'mirror neurons', and the role they play in a decision like Robert's
2) The heavily-researched social science phenomenon known as 'emotional contagion'
3) Ignorance and misperceptions around the idea of 'happy people'"
