The Woodstock Music and Art Fair reached its third day near Bethel, New York, as Janis Joplin and other acts performed for a mud-soaked crowd of roughly 400,000.

Roughly 400,000 people descended on a dairy farm in Bethel, New York, for the start of the Woodstock Music and Art Fair, a defining moment of the counterculture era.

As Woodstock wound down after three chaotic days, Jimi Hendrix took the stage before a dwindling crowd to close the festival.

The Concorde prototype broke the sound barrier for the first time, proving the Anglo-French jet could achieve sustained supersonic commercial flight.

A 27-year-old army officer named Muammar Gaddafi led a bloodless coup that toppled Libya's monarchy, beginning a 42-year rule.

Engineers at UCLA successfully sent the first data transmission between two computers connected by the ARPANET, the precursor to the internet.

Engineers at UCLA connect the first two nodes of ARPANET, a Honeywell 516 minicomputer and a Sigma 7, launching the network that would become the internet.

Ken Thompson at Bell Labs completes early work on a file system and simple kernel running on a spare PDP-7 minicomputer, a foundational step toward Unix.

Pelé scored his 1,000th career goal from a penalty kick at Maracanã Stadium, a moment so anticipated that the match paused for a full-field celebration.

Brazilian football legend Pelé scored his historic 1,000th career goal, a penalty for Santos against Vasco da Gama in Rio de Janeiro's Maracanã Stadium.

Pope Paul VI arrived in Kampala, becoming the first reigning pope to visit sub-Saharan Africa, a landmark moment for the Catholic Church on the continent.

UCLA graduate student Charley Kline sent the first message over ARPANET to Stanford, crashing after typing just 'LO' of 'LOGIN'.

UCLA graduate student Charley Kline transmitted the first message over ARPANET to Stanford, and the system crashed after just two letters.

Apollo 12 lifted off from Kennedy Space Center and was struck by lightning 36 seconds later, briefly knocking out its instruments before the crew restored power.

Apollo 12 launched from Florida in a rainstorm, was struck by lightning 36 seconds after liftoff, and still went on to make the second crewed Moon landing.

Apollo 12 lifted off and was struck by lightning just 36 seconds later, knocking out telemetry before astronauts restored power and continued to the Moon.

Apollo 12 blasted off from Cape Kennedy and was struck by lightning 36 seconds later, briefly knocking out onboard power before crew and ground control saved the mission.

Apollo 12 launched from Kennedy Space Center and was struck by lightning twice within a minute of liftoff, briefly knocking out its instruments.

Astronauts Pete Conrad and Alan Bean conducted their second moonwalk of the Apollo 12 mission, retrieving parts from the earlier Surveyor 3 probe.

Pete Conrad and Alan Bean conducted their second moonwalk of the Apollo 12 mission, collecting lunar samples and retrieving parts from the unmanned Surveyor 3 probe.

Journalist Seymour Hersh publishes his exposé detailing the My Lai massacre, forcing American attention onto the killing of hundreds of Vietnamese civilians.

Astronauts Pete Conrad and Alan Bean land the Intrepid lunar module in the Moon's Ocean of Storms, the second crewed Moon landing in history.

Investigative journalist Seymour Hersh published detailed reports on the 1968 My Lai massacre, forcing American reckoning with wartime atrocities in Vietnam.

Apollo 12 astronauts Pete Conrad, Dick Gordon, and Alan Bean returned safely to Earth after the second crewed Moon landing mission.

Apollo 12 astronauts return to Earth after the second successful crewed Moon landing, splashing down in the Pacific Ocean.

Chicago police raided an apartment before dawn and killed Black Panther leaders Fred Hampton and Mark Clark in a controversial pre-dawn assault.