NEED DNA f.print ref for 15-16y.o's

[Peter Kaub]

I am demonstrating the idea of DNA fingerprinting to a group of bright
15-16 year olds at a Summer Science School and need to prepare a handout
on this subject.  Rather than reinventing the wheel, and saving me a bit 
of preparotory time, if anyone knows a good, well explained reference on
this subject that could be used in such a way could they please let me know.
Cheers in advance for any help.

Pete Kaub<p-kaub at murdoch.edu.au>