By revealing that he has cancer, Charles III breaks with centuries of royal tradition. Never complain, never explain, said Queen Elizabeth II.

Charles decided to break with his mother on that. But information about his health is still scarce. What about leaders in other parts of the world? In the United States, there is little or no debate about the public's right to know the status of its leaders. In the annals of power, leaders and their advisors strive to maintain (or at least not weaken) the image that they are strong and in control.