Dialetics for kids! http://home.igc.org/~venceremos/whatheck.htm
I do not know anything about dialetics of nature so I just didn a google search and that is what I got. It is actually a pretty good introduction, at least for me and probably Yhehve as well. It's a little bit to comlicated for kids, I think.Also the site designer gives a challenge for anyone to send him, via email, anything that is not made of opposites.
I might want to try that out.