Charles Barkla discovers that each element has a characteristic X-ray and that the degree of penetration of these X-rays is related to the atomic weight of the element.
November 3 – A speech given by Alois Alzheimer for the first time presents the pathology and clinical symptoms of pre-senile dementia together;[6][7] the condition will rapidly become known as Alzheimer's disease.[8]
BCG (Bacilli-Calmette-Guerin) immunization for tuberculosis first developed.
March 18 – At Montesson in France, Romanian inventor Traian Vuia becomes the first person to achieve an unassisted takeoff in a heavier-than-air powered monoplane, but it is incapable of sustained flight.
October 18 – German inventor Arthur Korn demonstrates the transmission of a photograph electronically over a distance of 1800 km[11] using his Bildetelegraph or phototelautograph system.
^Tswett, Mikhail (1906). "Physikalisch-Chemische Studien über das Chlorophyll: Die Adsorption". Berichte der Deutschen Botanischen Gesellschaft. 24: 316–326.
^Tswett, Mikhail (1906). "Adsorptionanalyse und chromatographische Methode: Anwendung auf die Chemie des Chlorophylls". Berichte der Deutschen Botanischen Gesellschaft. 24: 384–393.
^Reid, H. F. (1910). The Mechanics of the Earthquake, The California Earthquake of April 18, 1906: Report of the State Investigation Commission. Vol. 2. Washington, D.C.: Carnegie Institution of Washington.
^Porter, Roy (1997). The Greatest Benefit to Mankind: a medical history of humanity from antiquity to the present. London: HarperCollins. p. 474. ISBN978-0-00-215173-3.
^Alzheimer, Alois (1907). "Über eine eigenartige Erkrankung der Hirnrinde". Allgemeine Zeitschrift für Psychiatrie und Psychisch-Gerichtlich Medizin. 64 (1–2): 146–148.
^Berchtold, N. C.; Cotman, C. W. (1998). "Evolution in the conceptualization of dementia and Alzheimer's disease: Greco-Roman period to the 1960s". Neurobiology of Aging. 19 (3): 173–89. doi:10.1016/S0197-4580(98)00052-9. PMID9661992.
^Bancroft, T. L. (1906). "On the aetiology of dengue fever". Australian Medical Gazette. 25: 17–18.