April 12th is Walk On Your Wild Side Day and Grilled Cheese Sandwich Day.
UK Prime Minister Boris Johnson apologized for hosting a party during the height of COVID-19 lockdowns.
Project Starshot was announced by Yuri Milner, Stephen Hawking, and Mark Zuckerberg.
Hillary Clinton announced her candidacy for US President.
The Zimbabwean dollar was suspended indefinitely.
The 'Twentieth Century Dinosaurs' exhibit opened at the Smithsonian Institution Museum of Natural History.
The first Space Shuttle mission was launched.
The world's first person visited space.
Jonas Salk's Polio vaccine tested by Jonas Salk was given final approval by the US Food and Drug Administration.
Rock Around The Clock by Bill Haley and His Comets was recorded.
Israeli Knesset chose April 13 as the official Holocaust Remembrance Day.
The Battle of Fort Sumter in South Carolina between the United States and the Confederate States started the American Civil War.
Cardinal Bellarmine condemned Galileo for stating that the earth revolved around the sun.
Crusaders from the Fourth Crusade broke through Constantinople's walls and entered the great city.
Shapur I became co-emperor of the Sasanian Empire with his father Ardashir I.
