- 1684 - A patent was granted for the thimble.
- 1792 - The guillotine was first used to execute highwayman Nicolas J. Pelletier.
- 1846 - The Mexican-American War ignited as a result of disputes over claims to Texas boundaries. The outcome of the war fixed Texas' southern boundary at the Rio Grande River.
- 1859 - Work began on the Suez Canal in Egypt.
- 1953 - Dr. James D. Watson and Dr. Francis H.C. Crick suggested the double helix structure of DNA.
- 1959 - St. Lawrence Seaway opened to shipping. The water way connects the Great Lakes and the Atlantic Ocean.
- 1961 - Robert Noyce was granted a patent for the integrated circuit.
- 1962 - The U.S. spacecraft, Ranger, crashed on the Moon.
- 1967 - Colorado Governor John Love signed the first law legalizing abortion in the U.S. The law was limited to therapeutic abortions when agreed to, unanimously, by a panel of three physicians.
- 1980 - In Iran, a commando mission to rescue hostages was aborted after mechanical problems disabled three of the eight helicopters involved. During the evacuation, a helicopter and a transport plan collided and exploded. Eight U.S. servicemen were killed. The mission was aimed at freeing American hostages that had been taken at the U.S. embassy in Tehran on November 4, 1979. The event took place April 24th Washington, DC, time.
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