Harambe the Gorilla was shot to death inside his enclosure in the Cincinnati Zoo and Botanical Garden.
The first-ever cloned horse was born in a natural delivery.
Leonardo da Vinci's 'The Last Supper' was returned to display in Milan after 22 years of restoration.
NASA tested the Saturn I launch vehicle with a boilerplate Apollo spacecraft for the first time.
Eisenhower signed a farm bill that allowed the government to store agricultural surplus.
The women of Greece were given the right to vote.
The German automobile manufacturer, Volkswagen, was founded.
Alan Turing submitted his paper 'On Computable Numbers' for publication, in which he set out the hypothetical basis for modern computers.
The Dionne quintuplets were born to Oliva and Elzire Dionne, who later became the first quintuplets to survive infancy.
The first all-color and all-talking picture, 'On With the Show,' was released.
The Sierra Club was formed.
The second black regiment (54 Mass) left Boston to fight in US Civil War.
US President Andrew Jackson signed the Indian Removal Act.
Joan of Arc was accused of reverting into heresy by donning male clothing again.
