Boys Hit Puberty Sooner Now, Study Finds by Alan Mozes.  U.S. News and World Report.  October 20, 2012.

Building upon research from the 1990's which showed that girls are entering puberty at an earlier age,  University of North Carolina public health researchers have found that boys are also entering puberty earlier.  They have found that black boys are entering puberty at 9, whites at 10, and Hispanics at 10-11.  The researchers were surprised at this result since the factors that sped the process in girls should have slowed the process in boys.  Of concerns was the growing gap between physical and social maturation.