Israeli Knesset chose April 13 as the official Holocaust Remembrance Day.
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Project Starshot was announced by Yuri Milner, Stephen Hawking, and Mark Zuckerberg.
The Battle of Fort Sumter in South Carolina between the United States and the Confederate States started the American Civil War.
Jonas Salk's Polio vaccine tested by Jonas Salk was given final approval by the US Food and Drug Administration.
UK Prime Minister Boris Johnson apologized for hosting a party during the height of COVID-19 lockdowns.
Cardinal Bellarmine condemned Galileo for stating that the earth revolved around the sun.
