Psychology says adults who hold onto empty jars and containers are often seeking more than storage: Why ‘just in case’ thinking makes it hard to throw things away

Psychology suggests that nail biting is rarely a sign of immaturity, poor discipline or weak self-control. More often, it is the brain's way of seeking relief during moments of stress or internal unease. The key insight is that most adults who bite their nails are not intentionally trying to harm them, they are often trying to soothe themselves.

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