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In page Natalie Kalmus:

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Natalie married Herbert Kalmus on July 23, 1902 in Baldwinville, Massachusetts.[1] She studied at the University of Zurich and Queen's University in Ontario[2] where her husband also taught physics, electro-chemistry and metallurgy and earned his doctorate.[citation needed] The couple "secretly" divorced June 22, 1922, but they continued to live in "separate adjoining apartments" in Hollywood into the 1940s.[3][4] Despite their divorce, Natalie and Herbert continued to work together for over two decades, with most of their friends completely unaware that their marriage had ended.[5]