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Paul Revere recognizes dentures he had made for his friend Dr. Joseph Warren and thus identifies the doctor’s body in a mass grave at Bunker Hill.
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Johannes Purkinje (1787–1869) devises the first crude fingerprint classification system.
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Henry Goddard (1866–1957) matches two bullets to show they came from the same bullet mould.
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The first paper on hair analysis is published in France.
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Izaak van Deen (1804–1869) develops the guaiac test for blood.
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Friedrich Miescher (1844–1895) discovers DNA.
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Henry Faulds (1843–1930) shows that powder dusting will expose latent fingerprints.
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Sir Edward Richard Henry devises a fingerprint classification system that is the basis for those used in Britain and America today.
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Karl Landsteiner (1868–1943) delineates the ABO blood typing system.
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Oswald Avery (1877–1955), Colin MacLeod (1909–1972), and Maclyn McCarty (1911–2005) discover that DNA carries genetic information.