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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Chemistry: Strong acids and strong bases
Common strong acids and strong bases. Examples of calculating the pH of a nitric acid solution, sodium hydroxide solution, and a calcium hy…
VideoFree13 minutes
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Biology: Natural selection and the owl butterfly
How the "Owl Butterfly" may have gotten the spot on its wings. Biology Life is beautiful! From atoms to cells, from genes to proteins, from…
VideoFree13 minutes
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Biology: ATP & respiration
In which Hank does some push ups for science and describes the "economy" of cellular respiration and the various processes whereby our bodi…
VideoFree13 minutes
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Biology: Reaction coupling to create glucose-6-phosphate
Reaction coupling to create glucose-6-phosphate. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations t…
VideoFree7 minutes
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Biology: Genetic variation, gene flow, and new species
How genetic variation is the raw material of evolution, and how restricted gene flow can lead to the formation of new species. Video by Cal…
VideoFree12 minutes
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Cosmology and astronomy: Solar and lunar eclipses
Understanding solar eclipses and lunar eclipses. Why don't we have a solar eclipse every new moon (every time the Moon is between the Earth…
VideoFree6
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Biology: Photosynthesis
Hank explains the extremely complex series of reactions whereby plants feed themselves on sunlight, carbon dioxide and water, and also crea…
VideoFree13 minutes
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Biology: Allele frequency
Allele frequencies in populations and how they differ from genotype frequencies. Biology Life is beautiful! From atoms to cells, from genes…
VideoFree7 minutes
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Biology: Animal communication
Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-p…
VideoFree4 minutes
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Cosmology and astronomy: Cosmological time scale 2
Cosmological Time Scale 2 Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll learn about…
VideoFree6 minutes
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Biology: Discovering the tree of life
Discover the link between evolutionary trees and biodiversity. Video by California Academy of Sciences. Biology Life is beautiful! From ato…
VideoFree8 minutes
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Biology: Exocytosis
Introduction to exocytosis! Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology…
VideoFree4 minutes
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Biology: Thomas Malthus and population growth
Thomas Malthus's views on population. Malthusian limits. Biology Life is beautiful! From atoms to cells, from genes to proteins, from popul…
VideoFree8 minutes
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Biology: In da club - Membranes & transport
Hank describes how cells regulate their contents and communicate with one another via mechanisms within the cell membrane. Biology Life is …
VideoFree11 minutes
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Cosmology and astronomy: Why cepheids pulsate
Why Cepheids Pulsate Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll learn about the …
VideoFree7 minutes