Zamenhof-Esperanto object of 1044 Zamenhof-Esperanto objects in 54 countries") and until his death in 2001 he listed a total of 1260 such objects. It is he who coined the acronym "ZEO". Currently, Robert Kamiński of Poland is the person charged with the registration of ZEOs by the Universal Esperanto Association. The highest number of ZEOs per country is situated in Brazil. In Poland, the birthplace of Esperanto, there are more than a hundred of them. Zamenhof-Esperanto object A Zamenhof-Esperanto object (, ZEO) is a monument or a place linked to L. L. Zamenhof, the constructed language Esperanto he created and first published
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