As 79-year-old US President Donald Trump enters the second year of his second term, questions about his physical and cognitive health are a recurring topic amid viral images, defiant responses from the White House and a lack of medical disclosure. The debate echoes earlier controversies around the health of US leaders – and raises uncomfortable questions about transparency and power. Let’s be clear: we have no idea what his health condition is. All we can really assess is what we see,” presidential historian Barbara Perry says. “And what we witness is an almost octogenarian man who keeps nodding off at...