The lessons contain videos, readings, and interactive components, which are sequenced so that you can start from square one with any subject and slowly build your knowledge. Khan Academy is a free online learning service with course material covering math, science, art history, and other subjects. Where can you go online to learn-not just learn to solve an immediate problem, but advance your understanding of a topic or start studying something from scratch? For most academic subjects, the best place is Khan Academy.
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