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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Biology: Big Guns: The Muscular System
Hank tells us the story of the complicated chemical dance that allows our skeletal muscles to contract and relax. Biology Life is beautiful…
VideoFree12 minutes
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Biology: Biology overview
Overview of biology, the study of life. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosyst…
VideoFree5 minutes
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Biology: 2015 AP Biology free response 7
Olfactory neurons. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology is the s…
VideoFree9 minutes
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Biology: What is a biodiversity hotspot?
What a biodiversity hotspot is, and why these locations are important to preserve. Video by California Academy of Sciences. Biology Life is…
VideoFree6 minutes
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Cosmology and astronomy: Star field and nebula images
Star Field and Nebula Images Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll learn ab…
VideoFree7 minutes
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Health and medicine: Types of neurotransmitters
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: Bacterial meningitis
Dr. Charles Prober discusses prudent prescribing of antibiotics in the context of bacterial meningitis with 4th year medical student Morgan…
VideoFree12 minutes
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Organic chemistry: Alkyne nomenclature
Rules for naming alkynes (molecules with a carbon-carbon triple bond). Organic chemistry Sal and Jay cover topics covered in college organi…
VideoFree7 minutes
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Organic chemistry: Formation of acetals
How aldehydes react with alcohols via an acid-catalyzed mechanism to form acetals. Organic chemistry Sal and Jay cover topics covered in co…
VideoFree14 minutes
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Organic chemistry: Amide formation from acyl chloride
Amide formation from acyl chloride. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understan…
VideoFree9 minutes
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Cosmology and astronomy: Detectable civilizations in our galaxy 1
A framework for thinking about how many detectable civilizations are out there. Cosmology and astronomy It's a great, big universe out ther…
VideoFree13 minutes
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Health and medicine: Lub dub
Ever wonder why the heart sounds the way that it does? Opening and closing of heart valves makes the heart rhythm come alive with its lub d…
VideoFree10 minutes
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Chemistry: Stoichiometry: Limiting reagent
Stoichiometry problem where we find the limiting reagent and calculate grams of product formed. Chemistry Did you know that everything is m…
VideoFree15 minutes
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Health and medicine: Resetting cardiac concentration gradients
Watch as the heart cells use energy to reset the concentration gradients for all of the ions after the action potential has gone through. R…
VideoFree15 minutes
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Organic chemistry: Introduction to chirality
Introduction to chirality (handedness), and how chirality is related to the groups bonded to a central carbon. Organic chemistry Sal and Ja…
VideoFree7 minutes