One of the coolest things my buddies at Participate do is connect classrooms to the world, and this includes advocating and building awareness on world issues. One of those issues is the gender gap that is still prevalent today.
Participate has an easy to use infographic that discusses the issue. It gives you a data set, and it includes questions to make that classroom connection. Give it a look, or use Participate to find a whole bunch of other global resources you can use.
You can find the Infographic HERE