And that the characteristics adult children look for when they begin the search are not necessarily the things that make a difference to the people who are going to move in.
Not only can we never find the "perfect" punishment, our search for optimum penalties is complicated by our desire for fairness: to let the punishment fit the crime.
But the ferment in the Arab world echoes the struggle for freedom of oppressed peoples under communism, demonstrating that striving for freedom is not simply a Eurasian but a universal aspiration.
Much time has been spent, over the past century, on working out exactly what it is about the sound of fingernails on a blackboard that's so unpleasant.