Nordau was a Hungarian Zionist leader, physician, author, and social critic. He co-founded the World Zionist Organization with Theodor Herzl and was president or vice president of several Zionist congresses. As a social critic, he wrote a number of controversial books, including The Conventional Lies of Our Civilization, Degeneration, and Paradoxes. Nordau was a fully assimilated and acculturated European Jew when what controversy sparked his interest in Zionism? Discuss