"We suffered a terrible blow on 11 September 2001. We responded with fear and anger. A fight-or-flight response is adaptive in any species. For us, given our power, fight was the only response we could imagine."

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It happens that there are a lot of people who are very talented who also happen to have a mental disorder. A lot of the mental disorders are initially things that are adaptive. Like even OCD, it's good to sort of have structure and have certain rituals but when it gets to be extreme then it becomes problematic.

— H. A. Berlin