The World Health Organization was informed of cases of pneumonia with an unknown cause, detected in Wuhan. This later turned out to be COVID-19, the…

Vietnam War: Operation Linebacker II ends.

Leaders of the Khmer Rouge apologize for the 1970s genocide in Cambodia that claimed over one million lives.

South Australia and Adelaide are founded.

Soviet General Secretary Joseph Stalin orders the “liquidation of the kulaks as a class”.

Marie and Pierre Curie announce the isolation of radium.

World War II: Battle of Hong Kong ends, beginning the Japanese occupation of Hong Kong.

Pope John IV is elected, several months after his predecessor’s death.

History of Slovenia: In a referendum, 88.5% of Slovenia’s overall electorate vote for independence from Yugoslavia.

The Lincoln Tunnel opens to traffic in New York City