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1989 Astronomers discover pulsar in remnants of Supernova 1987A (LMC) 1985 Doctors discover a cancerous growth in President Reagan's colon 1975 Chinese archeologists discover a 3-acre burial site with 6,000 clay statues of warriors dating as early as 221 BC 1955 Clarton-Schwerdt and Schaffer discover polio virus 1953 Francis Crick and James Watson discover structure of DNA-molecule 1951 Leidse astronomers discover radio signal out of Milky Way system 1943 Nazi's discover mass grave of Polish officers near Katyn 1940 4 teens, following their dog down a hole near Lascaux France discover 17,000-year-old drawings now known as Lascaux Cave Paintings 1922 Banting, MacLeod and Best discover insulin 1921 Henrietta Leavitt, cepheid period-luminosity relation discover, dies 1912 English explorer Robert F Scott and his expedition reach South Pole, only to discover that Roald Amundsen had gotten there before 1845 Georg Cantor, German mathematician, discover transfinite numbers 1809 Joseph Liouville, France, discover of transcendental numbers 1756 Jacques Cassini, Fr astronomer (Discover rings of Saturn), dies at 79 1598 Netherland sailors discover Mauritius 1502 Portuguese navigators discover Rio de Janeiro

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