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: Hyperplasia in colon tissue
Dr. Andy Connolly from Stanford Medical School shows Sal what hyperplasia in colon tissue looks like Health and medicine The medical world …
VideoFree5 minutes
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Biology: Meiosis: Where the sex starts
Hank gets down to the nitty gritty about meiosis, the special type of cell division that is necessary for sexual reproduction in eukaryotic…
VideoFree11 minutes
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Chemistry: Weak base equilibrium
Quick overview of Kb and pKb. Examples of calculating the pH of a weak base solution. Chemistry Did you know that everything is made out of…
VideoFree11 minutes
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Chemistry: Covalent networks, metallic crystals, and ionic crystals
Covalent networks, metallic crystals, and ionic crystals: Some of the strongest molecular structures. Chemistry Did you know that everythin…
VideoFree9 minutes
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Health and medicine: Molarity vs. molality
Learn how molarity and molality differ! Rishi is a pediatric infectious disease physician and works at Khan Academy. Health and medicine Th…
VideoFree8 minutes
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Health and medicine: Changing the AV node delay - chronotropic effect
Find out exactly how your autonomic nervous system has a chronotropic effect (i.e. timing) that changes the delay between the contraction o…
VideoFree12 minutes
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High school biology: Can we clone extinct dinosaurs from DNA preserved in their fossils?
Paleontologists and molecular biologists have searched for a couple of decades to find and replicate DNA from some non-avian dinosaur fossi…
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Health and medicine: Polio epidemiology
Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-p…
VideoFree5 minutes
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Biology: Role of phagocytes in innate or nonspecific immunity
Role of phagocytes in innate or nonspecific immunity. Neutrophils, macrophages, and dendritic cells. MHC II. Biology Life is beautiful! Fro…
VideoFree16 minutes
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Chemistry: Free energy and cell potential
Relationship between Gibbs free energy and standard cell potential. Chemistry Did you know that everything is made out of chemicals? Chemis…
VideoFree8 minutes
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Cosmology and astronomy: Why S-waves only travel in solids
Why S-Waves Only Travel in Solids Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll lea…
VideoFree4 minutes
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Cosmology and astronomy: Intro to Moon phases
An introduction to the size of the Moon, the distance to the Moon, the relation of the 28-day cycle of the Moon to a month and understandin…
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Health and medicine: Iron deficiency and anemia of chronic disease treatment
Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…
VideoFree6 minutes
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Chemistry: Valence electrons and bonding
How to get Lewis structures from electron configuration, and how valence electrons are involved in forming bonds. Chemistry Did you know th…
VideoFree11 minutes
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Health and medicine: Transport of sperm via erection and ejaculation
Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…
VideoFree11 minutes