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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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
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High school biology: Kidney function and anatomy
High school biology The digestive and excretory systems Topic: Science Learn about all the sciences, from physics, chemistry and biology, t…
VideoFree8 minutes
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Biology: 2015 AP Biology free response 5
Phototropism investigation. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology…
VideoFree7 minutes
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Cosmology and astronomy: Pangaea
Pangaea - the idea of Pangaea and some of the evidence behind it Cosmology and astronomy It's a great, big universe out there. In this sect…
VideoFree6 minutes
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Biology: Eukaryopolis - The city of animal cells
Hank tells us about the city of Eukaryopolis - the animal cell that is responsible for all the cool things that happen in our bodies. Biolo…
VideoFree11 minutes
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Biology: Hydrolysis
How hydrolysis can break down polysaccharides (carbohydrates) like starch, cellulose, chitin and glycogen. Biology Life is beautiful! From …
VideoFree8 minutes