South African President Jacob Zuma, who joined the African Union in recognizing the new leadership last month, said NATO's military intervention in Libya undermined efforts by the pan-African body to find peaceful solutions for member states.
Robert Ivry of MDRC, a research body that evaluates policies intended to help poorer Americans, believes that intervention is needed at several stages: to encourage at-risk high-school students to graduate, to foster contacts with future employers and to encourage those who go to college to stay there.
Yet scientists believe 120 or so remains a stubborn limit beyond which the human body cannot live without some serious - and so far unknown - genetic intervention.