Every two years, football comes home... to Africa. This year, the Africa Cup of Nations is hosted by Cameroon and, no doubt, there's plenty to criticise: dodgy calls by the ref, questionable Covid-19 protocols and a deadly stampede that left eight dead. And yet, football fans the world over are enthralled. Every day brings new twists: minnows have upset powerhouses, and stars who normally spend winter in the European leagues have shown up for their national sides. So what exactly is it about AFCON that's got us riveted?