What to know about what you don’t know you know. #1: Intuition is very efficient—if you don't overthink it.
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You're right. It's not a science. That's why an undergraduate gets a BA in psychology and not a BS. Nobody really knows anything about the brain, but the symptoms that people exhibit are amazingly alike....so the "science" is figuring out what the diagnosis is with overlapping symptoms. Just like a medical doctor (just about every disease included a temperature).
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