Here is a list of things which happened on the 30th of June over the years:
French acrobat Charles Blondin crosses Niagara Falls on a tightrope. (1859)
Charles J. Guiteau is hanged in Washington, D.C. for the shooting death of President James Garfield. (1882)
Albert Einstein publishes the article “On the Electrodynamics of Moving Bodies”, in which he introduces special relativity. (1905)
The United States Congress passes the Meat Inspection Act and Pure Food and Drug Act. (1906)
U.S. President Warren G. Harding appoints former President William Howard Taft Chief Justice of the United States. (1921)
The Night of the Long Knives, Adolf Hitler’s ym”s violent purge of his political rivals in Germany, takes place. (1934)
The first Chevrolet Corvette rolls off the assembly line in Flint, Michigan. (1953)
A TWA Super Constellation and a United Airlines DC-7 (Flight 718) collide above the Grand Canyon in Arizona, United States, killing all 128 on board the two planes. (1956)
The crew of the Soviet Soyuz 11 spacecraft are killed when their air supply escapes through a faulty valve. (1971)
Ohio ratifies the 26th Amendment to the U.S. Constitution, lowering the voting age to 18, thereby putting the amendment into effect. (1971)
Thirty-nine American hostages from a hijacked TWA jetliner are freed in Beirut after being held for 17 days. (1985)
Doctors implanted a dual-purpose pacemaker in Vice President Dick Cheney’s chest. (2001)
The international Cassini spacecraft entered Saturn’s orbit after a nearly seven-year journey. (2004)
A car crashes into Glasgow International Airport in Scotland,a terrorist attack. (2007)