Some anomalies/questions which are not necessarily important, but do puzzle me or where I find existing explanations to be unsatisfying.
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A list of some questions which are not necessarily important, but do puzzle me or where I find existing ‘answers’ to be unsatisfying, categorized by subject (along the lines of Patrick Collison’s list & Alex Guzey & Sam Enright & Scott Alexander; see also my list of project ideas).