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  1. 1870 – Louis Pasteur and Robert Koch establish the germ theory of disease. 1878 – Ellis Reynolds Shipp graduates from the Women's Medical College of Pennsylvania and begins practice in Utah. 1879 – First vaccine for cholera .

  2. Jan 24, 2020 · We ended the 20th century with spaceships, computers, cell phones, and the wireless Internet all being technologies we can take for granted. 1900 The zeppelin invented by Count Ferdinand von Zeppelin .

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