Op ed columnist Nicholas D. Kristof of New York Times yesterday wrote the op ed "Divorced Before Puberty". The op ed is about the situation in Yemen, in light of the book I am Nujood, Age 10 and divorced. Kristof links to his further comments in his NYT blog "On the Ground". Here, he cites PRIO researcher Henrik Urdal's work on age distribution and risk of conlict.