Resources
http://crosslinks.mit.edu/topics/ - compendium of learning topics. Less technical than Wikipedia, links to relevant videos. Has some problems as well.
http://langorigami.com/ An Origami expert portal. My personal favorite place to understand the math behind origami. What excite me is the detail explanation shared on how to achieve a 1/3 fold and the extensive comparison between real paper folding and computer generated fold. _ 
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