July 11 is World Population Day, an annual U.N. event that focuses on the urgent issues affecting the world's booming population. This year's theme is "investing in teenage girls" — a call for attention and action on this particularly vulnerable part of the global population.
Of the more than 7 billion people in the world, approximately 1 billion are young girls between the ages of 10 and 24. And they're facing some big challenges, from high rates of child marriage to inadequate health care access.* Read more...