Khan Academy has delivered over 180 million lessons.
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Khan Academy's mission is to provide a free, world-class education to anyone, anywhere. Their online materials cover subjects ranging from math and finance to history and art. With thousands of videos and step-by-step problems, Khan Academy provides a rich and engaging learning experience.

One user says, "I always felt that a solid foundation for higher education was something I couldn't afford. Khan Academy has made subjects like Calculus and Chemistry accessible to me. Despite what I am financially limited to, I have a means to reach beyond what I am given in class and explore larger concepts. I'm typically a C- math student. Now I'm getting A's and B's. Access and understanding to such information is something the US needs very badly."

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