The "shot heard around the world" was fired. Colonial Minute Men took on British Army regulars at Lexington and Concord, Mass., starting the American Revolution.
Lord Byron died of a fever while helping the Greeks fight the Turks.
Naturalist Charles Darwin, developer of the theory of evolution, died.
The United States went off the gold standard.
The Warsaw ghetto uprising began, one of the first mass rebellions against the Nazis.
The siege at Waco, Texas, ended when FBI moved into the Branch Davidian compound with tear gas and cult members set fire to the compound killing over 80 people.
The Alfred P. Murrah Federal Building in Oklahoma City, Okla., was destroyed by a car bomb. 168 people, including 19 children were killed in the worst terrorist attack in U.S. history up to that time.
Germany's Cardinal Joseph Ratzinger became Pope Benedict XVI.
Here are the facts and trivia that people are buzzing about.