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His killing machines seemed to work just fine [1], although some seem to go towards a more interesting counterpoint for when HBO will make the inevitable series Da Vinci: The Machine, staring Leonardo di Caprio [2].

[1] How Leonardo da Vinci made a living from killing machines, https://theconversation.com/how-leonardo-da-vinci-made-a-liv...

[2] Leonardo’s War Machines – The Italian Genius May Have Deliberately Sabotaged His Own Designs, https://www.warhistoryonline.com/history/leonardos-war-machi...