Lidia Zamenhof Lidia Zamenhof Lidia Zamenhof (; 29 January 1904–1942) was a Polish writer, publisher, translator and the youngest daughter of L. L. Zamenhof, the creator of Esperanto. She was born on 29 January 1904 in Warsaw, then in partitioned Poland. She was an active promoter of Esperanto as well as of Homaranismo, a form of religious humanism first defined by her father. Around 1925 she became a member of the Bahá'í Faith. In late 1937 she went to the United States to teach that religion as well as Esperanto. In December 1938 she returned to Poland, where she continued to teach
Ludwik Hirszfeld 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 types. He was a cousin of Aleksander Rajchman, a Polish mathematician, and of Ludwik Rajchman, a Polish bacteriologist. After attending the Gymnasium in Łódź, Hirszfeld, born into a Jewish family and later a convert to Catholicism, decided to study medicine in Germany. In 1902 he entered the University of Würzburg and transferred in 1904 to Berlin, where he attended lectures in medicine and philosophy. Hirszfeld completed his doctoral