Q. I try to move turtles off the road so they won’t get run over. Box turtles never try to bite me. Snapping turtles always try to bite me. And they never appreciate my help. How aggressive are ...

Nail-biting, known medically as onychophagia, has long been considered a common habit, especially among children and teenagers. Yet doctors caution that the behaviour can be far more damaging than it ...