Well, that's certainly a better beginnger-friendly explanation that doesn't try to make up stuff. It does what I say in my second comment above: take small steps on firm ground. That's the way to do it, for sure.

I have no idea if you should change the link to point to it. What's best for HN?

Edit: I just realised who the author is of the lightbulb joke page: Jocelyn Ireson-Paine. He's the spreadsheet guy! Check out his stuff on making spreadsheets safer... with category theory (and Prolog):

http://www.j-paine.org/old_index.html#making_spreadsheets_sa...