Websites
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Think Java's all that and a bag of chips? Great; use this site from Princeton to test your recursion chops using everyone's favorite coffee-based language.
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All the recursion you know and love—minus a specific language. Aw, yes.
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Love fractals so much you want to make your own on your Windows computer? Check out this generator to fill that fractal-sized hole in your heart with smaller, repeating holes of the same shape.
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Tips and tricks on how—and when—iteration should replace recursion. No matter how much mathematicians love it.
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Even toddlers can practice recursion if they play the Towers of Hanoi game. Get your recursive steps on here in this virtual game.
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Check out the recursive art UPenn students made. From code.
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Human subcultures defined in a way that only xkcd could do it.
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Everything you wanted to know about recursion in the exciting, informative style you've come to know and love.
Articles
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Recursion isn't just for mathematicians; it shows up all over the place in nature, too. Check out what WIRED rates the most stunning examples of fractals you'll find IRL.
Video
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Fibonacci, the way it was meant to be: doodled.
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African culture and architecture is full of fractals (and therefore recursion).