One autumn day in 2020 Patrick Doherty was walking his dog up a steep mountain in County Donegal, Ireland, when he noticed he was, unusually for him, running out of breath. The eventual diagnosis was terrifying: amyloidosis, a rare genetic disease that caused a protein, amyloid, to build up in his organs and tissues. The prognosis was even worse: it would cause him years of pain until it finally killed him. In the face of such terrible fortune, though, Mr Doherty had a stroke of luck. He was able to join a trial of a new medical therapy and, with just a single injection, was apparently cured. Now, he continues to walk his dog up that steep mountain in County Donegal every week.