They studied it, played with it and observed reactions until they hit upon the concept of the scientific method which didn't happen until after the middle ages.<span>
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Disturbed thoughts, disturbed emotions, disturbed behaviors, disturbed impersonal and life situations, and biomedical disturbances are types of problems addressed by psychotherapy.
To go into the clinical geriatrician field it takes 4 years
I think the answer is "185-220 days".