"Some explanations that have been offered tread uncomfortably close to gender stereotypes: Perhaps, some suggest, women are more comfortable writing about personal issues or are too nuanced in their thinking to reduce complex issues into 700 words. Or maybe more men have the capacity to sound certain, even if rarely right. But there’s a more obvious obstacle. While powerful women in government — Clinton, Napolitano, Rice — belie the notion that national security is a man’s field, the academy and think tanks that house foreign affairs opinion writers are still predominantly male."