Israeli Knesset chose April 13 as the official Holocaust Remembrance Day.
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Jonas Salk's Polio vaccine tested by Jonas Salk was given final approval by the US Food and Drug Administration.
The Battle of Fort Sumter in South Carolina between the United States and the Confederate States started the American Civil War.
The 'Twentieth Century Dinosaurs' exhibit opened at the Smithsonian Institution Museum of Natural History.
Hillary Clinton announced her candidacy for US President.
UK Prime Minister Boris Johnson apologized for hosting a party during the height of COVID-19 lockdowns.
