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This category may require frequent maintenance to avoid becoming too large. It should directly contain very few, if any, articles and should mainly contain subcategories.
"Mystery" is a loosely-defined term for either unsolved problems (especially unsolved crimes) and for the (alleged) "paranormal".
Please do not place articles here because a topic "has been described as" "a mystery".
use one of the following categories:
allegedly (according to widely known popular literature) "paranormal" mysteries
fictional or artificial mysteries
problems with known solutions