1964 – U.S. President Lyndon B. Johnson launches his Great Society program.

1856 – Congressman Preston Brooks of South Carolina severely beats Senator Charles Sumner of Massachusetts with a cane in the hall of the United States Senate for a speech Sumner had made regarding Southerners and slavery.

1846 – The Associated Press is formed in New York City as a non-profit news cooperative.

2017 – Ringling Bros. and Barnum & Bailey Circus performed their final show at Nassau Veterans Memorial Coliseum.

2011 – Radio broadcaster Harold Camping predicted that the world would end on this date.

1992 – After 30 seasons Johnny Carson hosted his penultimate episode and last featuring guests (Robin Williams and Bette Midler) of The Tonight Show.

1927 – Charles Lindbergh touches down at Le Bourget Field in Paris, completing the world's first solo nonstop flight across the Atlantic Ocean.

1983 – First publications of the discovery of the HIV virus that causes AIDS in the journal Science by a team of French scientists including Françoise Barré-Sinoussi, Jean-Claude Chermann, and Luc Montagnier.

1964 – Discovery of the cosmic microwave background radiation by Robert Woodrow Wilson and Arno Penzias.

1873 – Levi Strauss and Jacob Davis receive a U.S. patent for blue jeans with copper rivets.

1609 – Shakespeare's sonnets are first published in London, perhaps illicitly, by the publisher Thomas Thorpe.

1570 – Cartographer Abraham Ortelius issues Theatrum Orbis Terrarum, the first modern atlas.

1974 – Nuclear weapons testing: Under project Smiling Buddha, India successfully detonates its first nuclear weapon becoming the sixth nation to do so.

1896 – The United States Supreme Court rules in Plessy v. Ferguson that the "separate but equal" doctrine is constitutional.

2004 – The first legal same-sex marriages in the U.S. are performed in the state of Massachusetts.

1990 – The General Assembly of the World Health Organization (WHO) eliminates homosexuality from the list of psychiatric diseases.

1954 – The United States Supreme Court hands down a unanimous decision in Brown v. Board of Education of Topeka, Kansas, outlawing racial segregation in public schools.

1902 – Greek archaeologist Valerios Stais discovers the Antikythera mechanism, an ancient mechanical analog computer.

1960 – Theodore Maiman operates the first optical laser (a ruby laser), at Hughes Research Laboratories in Malibu, California.

1888 – Nikola Tesla delivers a lecture describing the equipment which will allow efficient generation and use of alternating currents to transmit electric power over long distances.