Louis-Christophe Zaleski-Zamenhof as not only the first such World Congress in the third millennium of the civil calendar but also the third century of Esperanto, reminding the delegates: "You came to discuss intercultural dialogue, the pressing need for which inspired the initiation of the international language. In fact, almost all his biographies relate the story of the young Ludwik Łazarz Zamenhof living in the multicultural city of Białystok, observing the animosity that then governed relations among the varied nationalities, not finding a commonly understandable language, a tool that was, as he said, necessary for dialogue among the respective cultures. Mutual dialogue enables
Ludwik Hirszfeld Hirszfeld was the first to foresee the serological conflict between mother and child, which was confirmed by the discovery of the Rhesus factor. Upon this basis he developed, in the last years of his life, an "allergic" theory of miscarriage and recommended antihistamine therapy. Hirszfeld also investigated tumors and the serology of tuberculosis. His discovery of the infectious agent of paratyphoid C had far-reaching consequences for differential diagnosis. Ludwik Hirszfeld Ludwik Hirszfeld (5 August 1884 in Warsaw – 7 March 1954 in Wrocław) was a Polish microbiologist and serologist. He is considered a co-discoverer of the inheritance of ABO blood