Groups the atlas's recorded open questions, points where the field's own research is genuinely unsettled, such as unresolved debates between rival schools or a gap a landmark study left unanswered. The grouping comes from the open question type rather than from any subcategory tree, since an open question is tied to the specific subject it questions rather than to a branch of its own. It deliberately excludes settled findings the field treats as established, recorded as ordinary facts on the subject's own entity instead of as an open question.