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| | |  | 1261: Michael VIII Palaeologus recovers the city of Constantinople and is crowned Byzantine emperor there, restoring Greek control over the Byzantine Empire after a half century of Latin rule. Learn more about Michael VIII Palaeologus.
 1895: Pierre Curie marries fellow chemist Marie Sklodowska. The two researchers will share the Nobel Prize for physics in 1903 for their work on radioactivity. Learn more about Pierre Curie.
 1929: Pope Pius XI makes the first public appearance by a pope outside the Vatican since 1870. Learn more about Pius XI.
 1978: Louise Joy Brown, the world's first "test-tube" baby, is born in England. She is the product of in vitro fertilization, in which the mother's egg is fertilized outside of her body. Learn more about In Vitro Fertilization.
 1997: K. R. Narayanan is sworn in as president of India, becoming the first member of India's Dilit or "untouchable" caste to lead the country. Learn more about the Caste system.
 1999: American cyclist Lance Armstrong wins the Tour de France, bicycle racing's top event, less than three years after being diagnosed with testicular cancer. Learn more about Cycling.
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| Mystery Person of the Day |
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| | |  | Who am I? I was born on this day in 1920. My research contributed to the discovery of the structure of DNA.
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