The ultimate cause for those who pretend that there are no innate differences between men and women is sending women to war. More women have been closer to the front lines in Iraq than in any war in history. A CNN report indicates that the toll of war may be even greater for women than for men:

“‘Based on anecdotal evidence, not formal data, women who are mothers, especially with younger children … tend to feel guilty being away from their children,’ she says. ‘This is where we really don’t have a whole lot of data yet on re-integration.'”