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The reCaptcha debate that went on earlier reminded me of this TED talk[^] by Luis von Ahn. I posted that link in the earlier thread, but I doubt that most people are going to see it because of how deep it is. I also imagine that this TED talk was linked to at some point either in here or in The Insider News, but I don't really want to spend the time to look for it.
EDIT: I guess I should add that I have actually used Duolingo, the language learning system he discusses. It is really nice. I'm using it to just casually learn German. It teaches you how to read/write and listen/speak the language. It's all broken into nice short lessons which are arranged in a giant prerequisite tree. Once you've obtained enough points from a certain category/lesson, it opens up the lessons further down the tree from that one.
The United States invariably does the right thing, after having exhausted every other alternative. -Winston Churchill
America is the only country that went from barbarism to decadence without civilization in between. -Oscar Wilde
Wow, even the French showed a little more spine than that before they got their sh*t pushed in.[^] -Colin Mullikin