On the issue of teacher dress codes, I've been surprised at the attention to what female teachers wear and the limits placed on them. A neighbor who taught pre-k was advised once by a principal to ...

Ms. Antecol and her colleagues found that girls taught by a female teacher, as opposed to a male teacher, saw their math test scores drop by 4.7 percenage points by the end of the school year.

Perhaps most notably, the percentage of female STEM teachers has dramatically increased from 43 percent in 1988 to 64 percent in 2012. And while STEM teachers are still mostly white, racial ...