1348 - Black Death, 1451 - Printing press, 1543 - Fabricus published, 1665 - Great Plague, 1798 - Smallpox vaccine, 1842 - Chadwick's report, 1858 - Great Stink, 1861 - Germ Theory, 1900 - Blood transfusions, 1941 - Penicillin mass produced, 1948 - Formation of the NHS,

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