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There's also a strong positive correlation between incidence of depression and intelligence.

• rmetzler 12y ago
  True. Also depression seems to be an illness human beings may inherit. Physical exercises are known to help depression. Sitting in front of a computer screen all day long without much social interaction seems to make it worse (at least for me).
  • thathonkey 12y ago
    Of the serious mental illnesses, they're almost always inherited.