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"The Khan Academy is a not-for-profit organization with the mission of providing a high quality education to anyone, anywhere. We have 1000+ videos on YouTube covering everything from basic arithmetic and algebra to differential equations, physics, chemistry, biology and finance which have been recorded by Salman Khan."

"This page will get you started building your first app: A picture of a kitty that meows when you pet it. You can also watch a video (http://www.youtube.com/watch?v=nC_x9iOby0g) of this app being built. When you're done building Hello Purr, you'll be ready to design and build apps on your own. Before starting, make sure that you've set up your computer."