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Why some people can't help but bite their nails

Researchers say biting nails is just one way that type-A people cope. Nail biters chew more when they're prevented from finishing their work on time, the study reports.
/ Source: TODAY

Researchers say biting nails is just one way that type-A people cope. Nail biters chew more when they’re prevented from finishing their work on time, the study reports.