On April 18

The United States Department of Justice released a redacted version of the Mueller report about the investigation of Russian influence on the U.S. presidential election to Congress and the public.

A ladle spilled 30 tonnes (33 tons) of molten steel in a factory in Liaoning, China, killing 32 workers.

Operation Grapes of Wrath: Israeli forces shelled Qana, Lebanon, killing at least 100 civilians and injuring more than 110 others at a United Nations compound.

Robert Mugabe became the first prime minister of Zimbabwe, beginning a 37-year period in power.

Aryabhata, India's first satellite, was launched from Kapustin Yar in the Soviet Union.

Controversial American poet Ezra Pound was released from St. Elizabeths Hospital, a psychiatric hospital in Washington, D.C., in which he had been incarcerated for twelve years.

The Republic of Ireland Act 1948 came into force, describing Ireland as a republic and ending its membership in the Commonwealth of Nations.

The final session of the League of Nations concluded in Geneva, with delegates agreeing to transfer much of its assets to the United Nations.

Superman, created by Jerry Siegel and Joe Shuster of DC Comics, made his debut in Action Comics #1, the first true superhero comic book.

World War I: Hit by ground fire, French aviation pioneer Roland Garros (pictured) landed his aircraft behind enemy lines and was taken prisoner by German forces.

The painted ceilings of the Natural History Museum, London, were unveiled when the building opened its doors to the public.

American Civil War: African-American Union soldiers were massacred and mutilated during and after the Battle of Poison Spring.

American Revolutionary War: Colonists Paul Revere and William Dawes, later joined by Samuel Prescott, began a midnight ride to warn residents of Lexington and Concord, Massachusetts, about the impending arrival of British troops.

Glorious Revolution: Provincial militia and citizens in Boston revolted, arresting officials of the Dominion of New England.