I love Ned, don't you? He is so conventional and grounded. His girlfriend is never around, risking her life all the time, and he does not complain much.
I also love so far the details and complexity concerning how to produce electricity and Tesla's research. I think it is important for children to know that, if we are ever to solve the energy crisis and save the planet.
And if you think back to the Tomb of the Lost Queen, all this egyptology and hieroglyphs were not easy either.