One argument for the primacy of teaching moral science (ethics) in school is that ethical grounding is necessary for healthy individual and community life. Those who are ethically grounded suffer fewer personality disorders than those who are not, and thus are able to contribute a great deal more productivity to their communities and society. Also, since human societies are constantly changing, we face new and unexpected ethical dilemmas to which there are no answers yet. One example of this is the current status of machines like robots that have "artificial intelligence." It is speculated that if such beings become intelligent enough, they may be due certain rights and privileges similar to those granted to human beings. Teaching ethics in schools ensures that community members seriously engage these questions.