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May 17
1792: The New York Stock Exchange is formed.
In 1883: Svante Arrhenius was struck by the ideas for his dissociation theory during a sleepless night. This theory explains that substances like salt (ex. sodium chloride) when dissolved in water, dissociate (separate) into electrically charged ions (ex. positive sodium ions and negative chloride ions). The idea was controversial at first, but is now a basic fact in understanding the chemistry of ionic compounds.
1875: The first Kentucky Derby is run at Churchill Downs in Louisville, KY.
1954: In the landmark case Brown v. Board of Education of Topeka, the Supreme Court unanimously rules that racial segregation in public schools is unconstitutional.
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