Khan Academy: 2757 products
Khan Academy is an organization on a mission. We're a not-for-profit with the goal of changing education for the better by providing a free world-class education for anyone anywhere.
All of the site's resources are available to anyone. It doesn't matter if you are a student, teacher, home-schooler, principal, adult returning to the classroom after 20 years, or a friendly alien just trying to get …
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Health and medicine: Adding up resistance in series and in parallel
Learn about how resistance can be added up in series and in parallel (similar to electrical circuits!). Rishi is a pediatric infectious dis…
VideoFree11 minutes
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Health and medicine: Mitral stenosis
Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…
VideoFree9 minutes
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Health and medicine: Preventing TB transmission
There are a number of ways that we can help to prevent TB from spreading, learn some of the most common ones. Rishi is a pediatric infectio…
VideoFree11 minutes
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Biology: Role of the sarcoplasmic reticulum in muscle cells
The role of the sarcoplasmic reticulum in controlling calcium ion concentrations within the muscle cell. Biology Life is beautiful! From at…
VideoFree15 minutes
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Biology: 5 human impacts on the environment
Hank presents examples of how human activity can affect ecosystems. Biology Life is beautiful! From atoms to cells, from genes to proteins,…
VideoFree10 minutes
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Organic chemistry: Halogenation and ozonolysis of alkynes
Reaction of an alkene with a diatomic halogen (halogenation) or with ozone (ozonolysis). Organic chemistry Sal and Jay cover topics covered…
VideoFree7 minutes
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Organic chemistry: Aldol condensation
In aldol condensation, an enolate ion reacts with another carbonyl compound to form a conjugated enone. The process occurs in two parts: an…
VideoFree11 minutes
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Health and medicine: The bronchial tree
Follow the path of an oxygen molecule as it makes its way from your mouth down to an alveolus! Rishi is a pediatric infectious disease phys…
VideoFree13 minutes
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Biology: Gel electrophoresis
Introduction to gel electrophoresis. How it's used to separate DNA fragments or other macromolecules. Biology Life is beautiful! From atoms…
VideoFree11 minutes
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Biology: Why carbon is everywhere
Hank discusses the properties of carbon and the bonding behavior of atoms. Biology Life is beautiful! From atoms to cells, from genes to pr…
VideoFree10 minutes
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Cosmology and astronomy: How we know about the earth's core
S-wave shadow and P-wave detection patterns give us information about the core Cosmology and astronomy It's a great, big universe out there…
VideoFree6 minutes
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Health and medicine: Semantic networks and spreading activation
Learn about how knowledge is organized in the mind. Health and medicine The medical world can be a confusing place. Patients, their famili…
VideoFree4 minutes
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Organic chemistry: Nomenclature of aldehydes and ketones
Rules for naming aldehydes and ketones. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic under…
VideoFree13 minutes
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Biology: Correction to sodium-potassium pump video
Correction to "Sodium-potassium pump" video. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ec…
VideoFree7 minutes
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Health and medicine: Diagnosing Parkinson's disease
Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-p…
VideoFree10 minutes