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Directing experiment to understand insight of the coarseness change.

Rub your index fingers mildly over a piece of very coarse sandpaper a few times as well as rate its coarseness on a scale from 1 very soft to 7 very coarse. Afterward a minute or two rub the same finger over the paper as well as again rate its coarseness. Did your insight of the coarseness change? How?

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