377869 16: (FILE PHOTO) A photographic portrait is displayed showing Abraham Lincoln, the 16th president of the United States. Retired physician and medical historian, Norbert Hirschhorn wrote a study that suggests Lincoln''s use of a medication in the form of a blue pill for depression contained enough mercury to cause uncontrollable bouts of anger in the President and could have eventually killed him had he not stopped taking the pills. (Photo by Hulton/Archive/Getty Images)
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