Maybe all Catholics know this, but I’m not Catholic and I was surprised to learn that the groups of women you see at airports in habits are not nuns, nor were the women who traditionally wielded rulers in parochial schools. It seems all nuns are sisters, but not all sisters are nuns: nuns are cloistered, sisters need not be. “[S]isters working outside their convent cannot possibly be cloistered, and therefore those working in … school are definitely not nuns.”
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