*The Mathematics Teacher*asked me to write an expanded and illustrated version of that post. I did, and it was published as an op-ed in that journal in the November 2010 issue.

Since then, the original post has become the most popular one on this blog. Since there is so much interest, I decided to make the much-improved journal version available on my Web site. You can read it here.

On the same page, I added a short video that dates from around the same time, in which I demonstrate a couple points I make in the article.

--Henri

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