khanacademy.org
khanacademy is a service for Free Online Courses, Lessons & Practice. It highlights Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere.
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可汗学院（Khan Academy）是一项提供免费在线课程、教学内容及练习题的服务。 它主打免费学习数学、艺术、计算机编程、经济学、物理、化学、生物、医学、金融、历史等各类学科知识。 可汗学院是一家非营利性机构，其使命是为世界各地的任何人提供免费的世界级教育。
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