Have them research ordnances for nearby urban areas, too. Not only will it help with their persuasive letters, but it can easily tie into a "government" unit. Either way, it's something they should know how to do as a a potential renter/homeowner someday. Those sorts of life lessons are sadly...
I've had humidity issues with my Nurture Right, too. I'm not going to complain about it too much, though, because it just saved a hatch of abandoned Nankin eggs. They really should have hatched a week ago, but between the broody abandoning them (and my not catching it for at least three days...
Our Ag Extension Office (through the University of Maryland) provides Kindergarten classes here with e-egg 'bators, eggs, a heated brooder box, feed and bedding - the whole nine yards - each Spring. The rest of the year, 4H kids, home-schoolers and other classrooms can borrow the equipment. It's...