Khan Academy began producing free and openly available videos and learning resources in 2006. They mostly cover math, physics and science, but offer limited coverage of other subjects, as well. All of Khan Academy's material is freely available on YouTube, but the newly launched Android app offers a quick and simple way to navigate and access its material, of which there is loads.
It has more than 10,000 videos, as well as in-depth articles in fields such as arithmetic, algebra, geometry, trigonometry, statistics, calculus, biology, chemistry and physics. We highly recommend spending some time exploring and an afternoon or two learning with Khan Academy. It's free, accessible and fun!
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