Scare them away by teaching the OSI model
Otherwise - use your network knowlegde and teach them about the cables and such stuff. Possible if the ressources are there, get them to make their own twisted pair cross over cables.
Also - the basics of computers construction and how it works, for instance processers and so on.
Many subjects to take on.
As for links ... well - I haven't got any (anymore), but I suspect it would be easy to find by using google or alltheweb.