There would also be the work of Niels Bohr on electrons, their orbits, and complementarity. Marie and Pierre Curie discovered radioactivity emanating from the heretofore undiscovered elements of radium and polonium. But, not all discoveries would emerge from physics. The science of medicine would begin in parallel during this period. There would be Roentgen’s X-rays; Landsteiner discovered the blood groups in 1901; the germ theory of disease opened a door into microbiology and nascent vaccines; and Paul Ehrlich’s “magic bullet” would result in a scientific treatment for syphilis.
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