one cause, lack of cleanliness. Gustav Adolf Michaelis, a professor at a maternity institution in Kiel, replied positively to Semmelweis' suggestions, but eventually committed suicide, feeling responsible for the death of his own cousin, whom he had examined after she gave birth. Only belatedly did his observational evidence gain wide acceptance; more than twenty years later, Louis Pasteur's work offered a theoretical explanation for Semmelweis' observations: the germ theory of disease. As such, the Semmelweis story is often used in university courses with epistemology content, e.g. philosophy of science courses—demonstrating the virtues of empiricism or positivism and providing a historical account of which types of knowledge count as scientific (and thus accepted) knowledge, and which do not. C. Hempel, just to mention one, dedicated the first pages of his Philosophy of Natural Science to Semmelweis, arguing that the latter's method is typical of contemporary scientific research, in that the doctor framed a series of hypotheses, verifying them through falsifying experiments in accordance with Hempel's deductive-nomological model. It has been seen as an irony that Semmelweis' critics considered themselves positivists, but even positivism suffers problems in the face of theories which seem magical or superstitious, such as the idea that "corpse particles" might turn a person into a corpse, with no causal mechanism being stipulated, after a simple contact. To his contemporaries, Semmelweis seemed to be reverting to the speculative theories of earlier decades that were so repugnant to his positivist contemporaries. The so-called Semmelweis reflex—a metaphor for a certain type of human behaviour characterized by reflex-like rejection of new knowledge because it contradicts entrenched norms, beliefs, or paradigms—is named after Semmelweis, whose ideas were ridiculed and rejected by his contemporaries. Other legacies of Semmelweis include: Semmelweis is now recognized as a pioneer of antiseptic policy. Semmelweis University, a university for medicine and health-related disciplines (located in Budapest, Hungary), is named after Semmelweis. The Semmelweis Museum of Medical History is located in the house where he was born. The Semmelweis Klinik, a hospital for women located in Vienna, Austria. The Semmelweis Hospital in Miskolc, Hungary. The Semmelweis Hospital in Kiskunhalas, Hungary. In 2008, Semmelweis was selected as the motif for an Austrian commemorative coin. Minor planet 4170 Semmelweis is named after him. A postage stamp was issued by Hungary on 1 July 1932 in the Famous Hungarians series: Stamp:Ignác Semmelweis (1818~1865), physician Inclusion as a Google Doodle to promote handwashing beginning