Jacinda Ardern has announced her resignation as prime minister of New Zealand, saying she "no longer has enough in the tank". The shock decision came in the PM's sixth year in office, as she faced the prospect of a gruelling general election in October and the very real possibility of defeat after two dazzling election victories. Because while her star continues to burn brightly around the globe, at home the shine was wearing off. New Zealand was swept up in Jacindamania when Ms Ardern was elected prime minister in October 2017, just weeks after being promoted to leader of the...