Monopoly is a good parallel for life in a pandemic because it deals out suffering at random, and it seems to go on forever. So people can be forgiven for asking: where’s our Get Out of Jail Free card? The answer might be vaccination passports. Or, it might not; the possibility of unintended consequences looms large. This week on How To vaccinate The World, Tim Harford will be asking if we need or want vaccine passports, and what problems they are trying to solve with his guests: Simon Calder, Travel Editor of The Independent, Professor Carsten Maple of the University of Warwick and Professor Melinda Mills of Oxford University.