April 23rd

Arizona Gov. Jan Brewer signed the nation's toughest illegal immigration measure into law.
Arizona SB 1070
Boris Yeltsin, the first freely elected Russian president, died at age 76.
Boris Yeltsin
The first YouTube video is posted. The 18-second clip “Me at the zoo” shows co-founder Jawed Karim at San Diego Zoo. It has been viewed more than 13 million times (2014).
Me at the zoo
The U.S. resumed diplomatic relations with Libya.
Libya–United States relations
James Earl Ray, convicted of assassinating Dr. Martin Luther King, Jr., died.
James Earl Ray
Kanellos Kanellopoulos flies across the Aegean Sea in a human-powered aircraft. The Greek Olympic cyclist flew a record-breaking 115 km (71 mi) from Crete to Santorini in the MIT Daedalus aircraft, which was named after the mythological inventor of aviation.
MIT Daedalus
The Coca-Cola Co. announced it was changing its secret formula for Coke. (Negative public reaction forced the company to revert to the original version.).
The discovery of the virus causing AIDS is announced. French virologists Luc Montagnier and Françoise Barré-Sinoussi were awarded the Nobel Prize in Medicine for the discovery of the HI virus.
Robert Gallo
The Rolling Stones release Sticky Fingers. The album is often considered one of the British rock band's best. It includes hits like “Brown Sugar” and ”Wild Horses”.
Sticky Fingers
Sirhan Sirhan was sentenced to death (later reduced to a life sentence) for the assassination of Robert F. Kennedy.
Assassination of Robert F. Kennedy
Leftist students at Columbia University in New York City began a weeklong occupation of several campus buildings.
Protests of 1968
Hank Aaron of the Milwaukee Braves hit the first of his 755 major-league home runs in a game against the St. Louis Cardinals. (Aaron's career total is second only to Barry Bonds.).
Hank Aaron
About 200 people died in a dance-hall fire in Natchez, Miss.
Rhythm Club fire
Child actress Shirley Temple was born in Santa Monica, Calif.
Shirley Temple
Robert E. Lee named commander of Virginia Confederate forces (US Civil War).
Robert E. Lee
James Buchanan, the 15th president of the United States, was born in Franklin County, Pa.
James Buchanan
President-elect George Washington and his wife moved into the first executive mansion, the Franklin House in New York City.
Samuel Osgood House
Playwright William Shakespeare died in Stratford-on-Avon, England.
William Shakespeare
William Shakespeare's "The Merry Wives of Windsor" is first performed, with Queen Elizabeth I of England in attendance.
The Merry Wives of Windsor
King Brian Boru of Ireland defeats Viking forces at Battle of Clontarf, freeing Ireland from foreign control.
Battle of Clontarf