As students critique their own work and that of their peers, they begin to see themselves as scientists. The technique of the teacher refusing to act as an expert is a powerful learning prompt for students. Experiment with alternatives to note taking. Girls often get so absorbed in taking down every bit of information that they miss out on discussions. Set aside some classes where no note taking is allowed, hand out lecture notes ahead of time, or rotate the note-taking responsibility, with notes shared afterward.
Girls like to join clubs and take classes with their friends.
A lone girl, who likes computers, is unlikely to join a computer club by herself. So if you sponsor a computer club, or teach computer science, invite girls to join clubs or classes as a group. Check out computing magazines - almost all of the photographs are of men. To offset this, when you invite speakers to classes or clubs, make sure you include women. Share information about women who are leaders in the field.