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I'd used double space after a period since third grade until last year, when I installed Lyx, which is a LaTeX editing tool. It wouldn't let me do double spaces, and that surprised me because it didn't even occur to me I'd been doing it. I lived in Lyx for the next week or so just to try it out and try to typeset my homework in LaTeX, but I eventually decided I didn't like Lyx, so I gave up on it. But it "cured" me of my habit of two space typing forever... after just a couple days. I still think it's fascinating how easily such an ingrained habit could be wiped away with just a little bit of negative feedback.