Jonny Thomson on Instagram: "The paradox of Santa’s list is a philosophical problem to do with moral motivation. It goes like this. Imagine there are three children playing in the playground. There’s Abby, Bobby, and Charlie. Suddenly, Bobby falls over and hurts himself. Charlie, who is a kind boy, rushes over to help Bobby. But Abby pauses a bit, and she thinks to herself, ’Well, next week is Christmas, and Santa is watching. So if I want to get onto his good list, I better help Bobby.’ And so,

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