>> http://rubyquiz.com/quiz25.html
>
> The quiz says that if you read a bit farther down.  ;)

:) I got down to Extra Credit #3 before thinking I'm not getting that much 
extra credit...

Also I don't think my submitted solution to that quiz had any code relevant 
to this exercise, although I have it sitting around in sub-release 
condition.

Wish me luck finding time to put something together.

Cheers,
Dave