Quiz WhatsApp THIS YEAR’S quiz is based on ten global cities. The first four answers of each series are linked to a theme, and readers have to find that theme to answer the fifth question. We are pleased to announce that this year’s winners, chosen at random from those who submitted all answers correctly. They are Linda Moore, David Roberts and Jim Walsh. Each of them will receive a copy of The Economist’s new book, “Unconventional Wisdom”. Congratulations to them and thank you to all who took part. London 1. Which British military hero is commemorated with a 52-metre high column i...