Incidental Inventions"This is my last column, after a year that has scared and inspired me." With these words, Elena Ferrante, the bestselling author of My Brilliant Friend, bid farewell to her year long collaboration with the Guardian. For a full year, she penned short pieces, the subjects of which were suggested by editors at the Guardian, turning the writing process into a kind of prolonged interlocution. The subjects ranged from first love to climate change, from