conuly

http://opinionator.blogs.nytimes.com/2010/02/21/division-and-its-discontents/

And an older one.

As for the first, the comments there are... interesting. The ones by people who plainly refuse to get it (one flatly says that if he can't understand a decimal like .12122122212222... then it literally doesn't exist to him, that's on the last page) are a little depressing. The ones by people who think they get it but don't (but are at least aware that there's a gap between their understanding and the writer's) aren't that great, but you can work with that.

But what I really dislike are the "Wow, *I* knew this when I was EIGHT" comments. Really? You have to do that? I knew how to read when I was three, but I don't go talking about it all the time. (Although it's funny when the commenter then goes on to say something hilariously ignorant, but you expect that.)