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1. Community
2. Content Requests and Feedback
3. Create High School chemistry and High School Physics Courses

High school-level biology, chemistry, and physics are all available on Khan Academy! Physics: https://www.khanacademy.org/science/physics Chemistry: https://www.khanacademy.org/science/chemistry Bi...

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3. Re-learning everything: Seeking general advice and book recommendations

In terms of generally re-learning topics like calculus or statistics, it's best to set aside a bit of time, like an hour or two, just practicing related problems. The easiest way to learn math conc...

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3. A question about Zero Dividing Numbers...

One of the main reasons it's undefined is because of the dilemma it presents. It seems to make sense that 0/0=0, right? Since 0 * 0 = 0.  However, let's think about another case. When you divide an...

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3. reading theory based books before or after taking calculus?

If you are interested in learning calculus, you must first learn algebraic concepts, since calculus can be thought of as an extension of algebra, mixed with concepts from trigonometry. Make sure th...

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2. Feature Requests and General Site Feedback
3. An offline version would be awesome

Hi! Although KA currently does not have an offline version, your idea sounds great to me. I'll forward the feedback to higher staff so that they can escalate it, and hopefully work on creating some...

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3. Calculating the derivative of a cosine function

One of the applications that I can think of has to do with physics. In fact, almost everything you learn in differential calculus is applied to physics. For example, the motion of an object attache...

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3. molecular orbital theory

@Pauline Yep, you can do it right here on Khan Academy! Here's the site home: https://www.khanacademy.org/science/chemistry However, if you just want to brush up and want some quick review, I would...

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3. molecular orbital theory

1. In molecular orbital theory, a covalent bond is formed whenever two atoms overlap all of their orbitals, regardless of whether they are valence orbitals or not, to create bonding and antibonding...

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2. Content Requests and Feedback
3. Request to add content about Einstein's theory of relativity

Wonderful, I'll go ahead and do that. 

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2. General Khan Academy Questions
3. Courses for Economics and Personal Finance

Hi Gina! On Khan Academy, we have a lot of different resources that both you and your child can use to learn economics and finance. These include:  The microeconomics page: https://www.khanacademy....