June 30th

The remains of a Vietnam War serviceman buried in the Tomb of the Unknown Soldiers were identified as those of Air Force pilot Michael J. Blassie.

South African ANC President Nelson Mandela meets with UN Secretary-General Boutros Boutros-Ghali at Dakar.

The first leap second is added to UTC. Leap seconds are added to Coordinated Universal Time (UTC) from time to time to account for the Earth's slowing rotation. UTC is the basis for the calculation of local times worldwide.

The 26th Amendment, which lowered the voting age to 18, was ratified by the states.

Superman 1st appears in DC Comics' Action Comics Series issue #1.

Margaret Mitchell's Gone with the Wind was published.

Adolf Hitler secured his position in the Nazi party by a "blood purge," ridding the party of other leaders such as Ernst Roehm and Kurt von Schleicher.

President Warren G. Harding appointed former president William H. Taft chief justice of the United States.

A powerful natural explosion from an unknown cause rocked the Tunguska Basin, in eastern Siberia, flattening hundreds of square miles of forest and resulting in tremors that could be felt hundreds of miles away.

In Russia, the 'Potemkin' arrives at Odessa, where sailors take the bodies of dead crewman ashore. sailors join civilians in revolutionary actions of the '1905 Revolution'

Famous debate on Charles Darwin's theory of evolution held at the Oxford University Museum and dominated by arguments between Thomas Henry Huxley and Bishop Samuel Wilberforce.

French acrobat Charles Blondin, AKA Jean Francois Gravelet, walked across Niagara Falls on a tightrope.

The Spaniards are expelled from Tenochtitlan.