if you don't know, you're about as sharp as a marble.

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Try to cut something with a marble-difficult when they are round. But if you are lost in the wilds and need to cut something,and only have a marble-crack it with a rock. Then the glass pieces can be used to cut. Do that and you will "be sharp as a tack".

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Having the brains of inbred royalty.

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hopeless...not sharp at all..

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