The idea that one's biochemistry may be associated with certain personality characteristics can be traced to the

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The idea that one's personality may be influenced by their bodily fluids (such as blood or bile) can be traced back to the ancient Greeks, particularly the physician Hippocrates who believed in a balance of four bodily fluids or "humors" that influenced personality traits. This concept was later expanded upon by the philosopher Galen.

The Idea That One's Biochemistry May Be Associated with Certain