Khan Academy has over 3,300 videos covering K-12 math, science topics such as biology, chemistry, and physics, and even finance and history. .
Khan Academy's mission is to provide free, world-class education to anyone, anywhere. With thousands of videos and step-by-step problems, their online materials cover subjects ranging from math and finance to history and art.
One user says, "As a mother of two, I never thought I would need to finish my college education while my babies were young. But when my husband left us, I realized that in order to provide for my family I had to finish somehow. I hadn't taken biology, chemistry, or math for a number of years and had forgotten much of what I had learned before. I have gotten A's in all my science courses thanks to your videos! I know I could never have done this without Khan Academy's wonderful organization. I am on my way to taking care of my children, and I know you will help them as well on their journey to excellent education."
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