Mexican-born serial killer Juan Vallejo Corona is convicted of the murders of 25 itinerant laborers. He had stabbed each of them, chopped a cross in the backs of their heads with a machete, and buried them in shallow graves in fruit orchards in Sutter County, California. At the time the crimes were the worst mass murders in U.S. history.

Harper Lee's racially charged novel To Kill a Mockingbird is published by J.B. Lippincott & Co. The book is hailed as a classic, becomes an international bestseller, and spawns a movie starring Gregory Peck, but is the only novel Lee would ever publish.

As part of the nuclear tests codenamed Operation Dominic, the United States detonates a one megaton bomb on Australian controlled Christmas Island, in the Indian Ocean. The island was a location for a series of American and British nuclear tests, and years later lawsuits claiming radiation damage to military personnel were filed, but none were settled in favor in the soldiers.

The German Air Force, aka the Luftwaffe, attacks shipping convoys off the coast of England, touching off what Prime Minister Winston Churchill describes as The Battle of Britain.