1898 Henri Becquerel Discovers Radioactivity: The French physicist Henri Becquerel identified natural radioactivity, paving the way for advancements in nuclear physics. 1898 Passing of Émile Zola: Renowned French novelist Émile Zola, celebrated for his role in defending Alfred Dreyfus, died. 1965 Canada Adopts the Maple Leaf Flag: Canada officially introduced its now-iconic Maple Leaf flag … Continue reading This Day In History