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: Becoming a red giant
Becoming a Red Giant Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll learn about the …
VideoFree12 minutes
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Biology: K-Ar dating calculation
Working through a calculation for K-Ar dating (good to have some prior experience with e and logarithms) Biology Life is beautiful! From at…
VideoFree11 minutes
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Biology: Myosin and actin
How myosin and actin interact to produce mechanical force. Biology Life is beautiful! From atoms to cells, from genes to proteins, from pop…
VideoFree10 minutes
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Biology: Viruses
Introduction to viruses. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology is…
VideoFree23 minutes
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Cosmology and astronomy: What causes precession and other orbital changes
What causes precession and other orbital changes Cosmology and astronomy It's a great, big universe out there. In this section of Khan Acad…
VideoFree2 minutes
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Biology: Lac operon
Overview of gene regulation in the Lac operon. Discussion of CAP, cAMP, lac repressor and allolactose in regulation of lac operon. Biology …
VideoFree11 minutes
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Biology: Heredity
Hank and his brother John discuss heredity via the gross example of relative ear wax moistness. Biology Life is beautiful! From atoms to ce…
VideoFree10 minutes
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Biology: Evolutionary development: Chicken teeth
Hank introduces us to the relatively new field of evolutionary developmental biology, which compares the developmental processes of differe…
VideoFree10 minutes
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Cosmology and astronomy: Scale of distance to closest stars
The nearest stars to our solar system, are located in the Alpha Centauri system. The two main stars are Alpha Centauri A and Alpha Centauri…
VideoFree8 minutes
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Biology: Extracellular matrix
Overview of how cells interact with the extracellular matrix. Biology Life is beautiful! From atoms to cells, from genes to proteins, from …
VideoFree7 minutes
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Organic chemistry: Amine naming 2
Amine naming 2. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understanding of basic high s…
VideoFree6 minutes
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Organic chemistry: Ozonolysis
Alkene cleavage using ozone. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understanding of…
VideoFree14 minutes
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Chemistry: pH of salt solutions
The pH of a salt solution is determined by the relative strength of its conjugated acid-base pair. Salts can be acidic, neutral, or basic.…
VideoFree14 minutes
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Biology: Boveri-Sutton chromosome theory
Overview of how chromosomes were first proposed as the carriers of Mendel's "heritable factors" (what we now call "genes"). Biology Life is…
VideoFree11 minutes
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Biology: Electrotonic and action potentials
Two different types of changes in the membrane potential of a neuron. Biology Life is beautiful! From atoms to cells, from genes to protein…
VideoFree10 minutes