I finished high school not that long time ago... I'm gonna say... Think Lean (startup lean) go to the high school and ask the kids what they want to know and what could make the presentation better for them and their friends.

As a kid, I really disliked listening to presentations from some random folks, because they were just talking and talking and talking about their job, lol. Make them interested in the field, show them why it's so cool. A million words are not gonna convince them, but if you show them something cool and show them the path to do it at home, some will get interested :)