Bashadow gave me a heads up on this. We might be able to help out getting attention towards experiments, particularly if aimed at primary aged children. I do see quite a few experiments being show cased in the homeschooling tag and I suspect some of the parents wouldn't mind getting some more ideas.
If I'm entirety honest, there are two types of people who respond to community challenges. Those who are passionate about the community and those who are drawn by the hope of good rewards and support (and I'm sorry to say that it's hive rewards above the tokens).
It looks like you're competing for attention with stemsocial as well.