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but the thing is... this is just how learning works in general. As you learn facts, the source evaporates away as the content is integrated with the rest of your knowledge.

once upon a time somebody told you (or you read) "Paris is the capital of France". For some period, you'd have a distinct episodic memory of the time and place for how you learned this fact. But as time passes, that episodic memory fades and eventually you're just left with the content "Paris is the capital of France" without the original source.