You know the ones. The moms or dads with chronically worried faces, who pre-empt every group parent meeting to talk about their child’s special needs, and seem oblivious to the eye-rolling of parents around them. The ones who wait outside the classroom at the end of each day to make sure their child is bringing home the right books. The parents who take the longest in the parent-teacher conferences. "Helicopter parents." "Smother mothers."