google-site-verification=UP5GFsl6cX1136_2dJEwhpPce5j9YzVrFy8j3bZKdp8 The Khan Academy Opens Its Virtual Doors - Herb Ripka

The Khan Academy Opens Its Virtual Doors

The Khan Academy Opens Its Virtual Doors — Carefully – http://mindshift.kqed.org/2011/11/the-khan-academy-opens-its-virtual-doors-carefully/
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