Probably French. The free.fr email/www addresses and the French typography of having spaces before punctuation other than plain commas and full-stops (like this ..., or this :, or even this ?) give it away. :)

> computation in Excel is becoming a solid meme

Somebody said that a decade ago and the responses provided invaluable pointers into regions of PL-theory I would not have consider explored this well... Happy reading ;)

[1] http://lambda-the-ultimate.org/node/2710

the author's email is yahoo.fr, so possibly french

I love Excel, and to show how it really is "better" notice nobody does these things in the FOSS spreadsheet wannabees...

I'm not going to argue that one spreadsheet solution is "better" than another as that is really a question of personal preference. However it should be noted that people do actually do these sorts of demos in other programs as well. And not just FOSS solutions but ive seen people do fanciful stuff in Google Docs too.