Jared Diamond's new book on leadership poses a question as old as history itself: when we celebrate a great figure, are we honoring a singular human gift, or merely the accident of timing? Drawing on a framework he calls the Hamlet test, Diamond surveys leaders across politics, business, and religion, concluding that most celebrated figures — Napoleon, Roosevelt, Bezos — could have been replaced by capable contemporaries, while a rare few, like Botswana's founding president Seretse Khama, were genuinely irreplaceable. The book invites us to sit with an uncomfortable truth: that much of what we