Ray Bradbury, whose greatest work is the dystopian classic Fahrenheit 451, died at age 91. [Take our quiz of famous authors.]

Ronald Reagan—who, as the 40th president of the United States (1981–89), became known for his conservative Republicanism, his fervent anticommunism, and his appealing personal style—died at age 93. [Sort fact from fiction in our quiz about U.S. presidents.]

AIDS was reported for the first time, following the detection of a rare form of pneumonia in five gay men in Los Angeles. [Learn the facts about HIV/AIDS.]

Israel—amid rising tensions with Egypt, Syria, and Jordan—staged a preemptive air assault and soundly defeated those Arab countries, notably seizing the Old City of Jerusalem and the Gaza Strip before a cease-fire.

In World War II, Allied forces entered Rome. [How much do you know about World War II?]

Canadian politician Joe Clark, who in 1979 became the country’s youngest prime minister, was born in Alberta. [Test your knowledge of Canada.]

Economist, journalist, and financier John Maynard Keynes, best known for his revolutionary economic theories on the causes of prolonged unemployment, was born in Cambridge, England.

The absolute monarchy in Denmark was abolished and replaced by a new constitution that established a constitutional monarchy with a parliament, as well as freedom of the press, religious freedom, and the right to hold meetings and form associations. [How much do you know about European history?]

Social philosopher and political economist Adam Smith, a towering figure in the history of economic thought, was baptized in Kirkcaldy, Fife, Scotland.