A pact of neutrality between the USSR and Japan is signed. The Pact of Neutrality between the Soviet Union and Japan was a bilateral agreement…
12 April 1955
The polio vaccine, developed by Dr. Jonas Salk, is declared safe and effective. Jonas Salk was an American medical researcher and virologist who is best…
11 April 2002
The Ghriba synagogue bombing by al-Qaeda kills 21 in Tunisia. The Ghriba synagogue bombing was a terrorist attack that occurred on April 11, 2002, at…
10 April 837
Halley’s Comet makes its closest approach to Earth at a distance equal to 0.0342 AU (5.1 million kilometres/3.2 million miles) Halley’s Comet is one of…
9 April 1957
The Suez Canal in Egypt is cleared and opens to shipping following the Suez Crisis. The Suez Canal is an artificial waterway that connects the…
8 April 1911
Dutch physicist Heike Kamerlingh Onnes discovers superconductivity. Superconductivity is a phenomenon that occurs when certain materials are cooled to extremely low temperatures, usually near absolute…
7 April 1954
United States President Dwight D. Eisenhower gives his “domino theory” speech during a news conference. Dwight D. Eisenhower was the 34th President of the United…
6 April 1973
Launch of Pioneer 11 spacecraft. Pioneer 11 was a NASA spacecraft launched on April 6, 1973, with the primary mission of studying the gas giant…
5 April 1976
In China, the April Fifth Movement leads to the Tiananmen Incident. The incident was a response to the sudden death of former Chinese Communist Party…
4 April 1963
Bye Bye Birdie, a musical romantic comedy film directed by George Sidney, was released. Bye Bye Birdie is a popular musical comedy that premiered on…