Hi. Great idea. QuarkNet does not discourage grad students mentoring HS students. Rather, it would just need to get faculty adviser buy-in to encourage this, since outreach time has to be considered important, just as is research time. Something very worthy to work and and follow up. Similarly, grad students participating as mentors in International Masterclasses is also a potentially great opportunity. There is significant value in having younger researchers (grad students) acting as mentors for students more junior than they.