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: Maternal changes in pregnancy
Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…
VideoFree7 minutes
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Health and medicine: Delusional disorder
Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-p…
VideoFree6 minutes
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Organic chemistry: Chiral vs achiral
Chirality is an important geometric property relating to a molecule's symmetry. A chiral molecule is non-superimposable with its mirror im…
VideoFree4 minutes
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Biology: 2015 AP Biology free response, 2a-b
Questions on cellular respiration. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, …
VideoFree12 minutes
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Health and medicine: Pre-capillary sphincters
Precapillary sphincters are segments of smooth muscle that help direct bloodflow into capillaries. Because there is a limited amount of blo…
VideoFree4 minutes
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Biology: DNA
Learn about DNA (deoxyribonucleic acid). Overview of DNA bases, complementary base pairing, and the structure of the double helix. Biology …
VideoFree13 minutes
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Chemistry: Stoichiometry
Stoichiometry expresses the quantitative relationship between reactants and products in a chemical equation. Stoichiometric coefficients in…
VideoFree10 minutes
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Health and medicine: What is laryngitis ?
Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…
VideoFree7 minutes
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Biology: Population ecology: The Texas mosquito mystery
Hank discusses population ecology, including the factors that limit population growth, using the example of a mosquito population. Biology …
VideoFree11 minutes
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Biology: Photosynthesis: Calvin cycle
The Calvin cycle, or the light-independent (dark) reactions of photosythesis. Biology Life is beautiful! From atoms to cells, from genes to…
VideoFree13 minutes
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Biology: Leading and lagging strands in DNA replication
Roles of DNA polymerase, primase, ligase, helicase and topoisomerase in DNA replication. An explanation of leading and lagging strands. Bio…
VideoFree10 minutes
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Health and medicine: Lung cancer staging
Health professionals use special terminology referred to as stages to concisely communicate the progression of cancer disease. Learn how ca…
VideoFree6 minutes
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Health and medicine: Functions of the nervous system
Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…
VideoFree7 minutes
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Cosmology and astronomy: Why gravity gets so strong near dense objects
Why Gravity Gets So Strong Near Dense Objects Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy…
VideoFree8 minutes
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Organic chemistry: Hydrogenation
Hydrogenation of an alkene using hydrogen gas and a platinum (or palladium or nickel) catalyst. The mechanism of syn addition of the hydrog…
VideoFree12 minutes