On this day in 1997, a team of British scientists working under the direction of Ian Wilmut at the Roslin Institute near Edinburgh announced the birth of Dolly the sheep, the first clone of an adult mammal.
| 1980: | | During the 1980 Winter Olympics, against the backdrop of the Cold War, the U.S. ice hockey team defeated the favoured Soviet team in one of the greatest upsets in the history of the Olympic Games. |
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| 1932: | | | The Purple Heart, a U.S. military decoration originally instituted by George Washington in 1782 to honour bravery in battle, was revived as an award for those wounded or killed in action against an enemy. |
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| 1847: | | | U.S. General Zachary Taylor led troops against a Mexican force commanded by General Antonio López de Santa Anna at the Battle of Buena Vista. |
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| 1680: | | Catherine Deshayes, Madame Monvoisin—known as “La Voisin”—was executed in Paris for her involvement in the Affair of the Poisons. |
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| 896: | | | Arnulf was crowned Holy Roman emperor by Pope Formosus, who declared the previous emperor, Lambert, deposed. |
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