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Physiologically, memories are anchored by emotions, so strong emotions kinda slow down time and turn on verbose logging so to speak. So anything you remember, even trivia, has *some* emotional payload making it memorable. Even 3.141592...
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Trivia, and arbitrary information like phone numbers that you end up memorizing, has indirect emotional payload, via rehearsal in contexts with a particular mood. For eg. your SSN is a number that usually comes up only in a slightly stressful condition, so it is stress-memorable.