Mar 5, 1970
The Nuclear Non-Proliferation Treaty went into effect after ratification by 43 nations.
Today is Multiple Personality Day.
Multiple Personality Discorder is Currently known as Dissociative Identity Disorder (DID) 多重人格障碍症。
In English, thanks to the story of Strange Case of Dr Jekyll and Mr Hyde（《《化身博士》）, people often refer to the disorder as Jekyll and Hyde.
Here is how to use it in a sentence:
The professor was a real Jekyll and Hyde - sometimes kind and charming, and at other times rude and obnoxious.
Mar 5, 1929
David Dunbar Buick, Scottish American inventor, founder of the Buick Motor Company, died at age 75.