In Chinese – I should say ancient – culture, each finger or groups of fingers are specialized in working with or doing something to a specific human orifice. For instance, the index and middle fingers are used to clean the anus, the ring finger is kept clean, and the pinky is used to cleanse the nostrils. Hence the longer fingernail for simple practicality.
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Name : John29225, Gender : M, City : Mahwah, State : NJ, Country : United States,