Answer the question in the comments section of this post. Don't google it or head to a reference book. What we're interested in is your answer, and, more importantly, what makes you say it.
UPDATE: We're so pleased with the responses so far, but we'd like to resolve this question in the interests of moving on with the rest of our inquiry into this unit of study. Here is Nicholas Kristof's response to the question (emphasis added), as quoted in an interview on NPR's On the Media:
Almost everybody you ask says that there are more females, you know, because in the U.S. there are more females, in Europe there are more females. But worldwide there are actually more males, and that is because so many women have been discriminated against to death.
But there are somewhere around 100 million women who have vanished because of this kind of discrimination, and that’s more than all the men who were killed in all the wars of the 20th century; it’s far more than were killed in all the genocides. When you have that kind of oppression that just feels like a transcendent issue.