Nail-biting–You’ll notice it in the car seat line, during story time, and at soccer. Tiny fingers drift to tiny teeth. Maybe they chew until the nails are ragged. Maybe they pick at the side-skin ...

Add Yahoo as a preferred source to see more of our stories on Google. New psychology research explains why nail-biting, procrastination and self-criticism may stem from the brain’s survival instincts.

Self-harming and self-sabotaging behaviours, from skin picking to ghosting people, all stem from evolutionary survival mechanisms, according to a compelling new psychological analysis. Clinical ...