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: Introduced species and biodiversity
Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology is the study of the fascina…
VideoFree10 minutes
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Biology: Origins of life
An overview of the question of how life first arose on Earth. Biology Life is beautiful! From atoms to cells, from genes to proteins, from …
VideoFree11 minutes
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Biology: Ozone layer and eukaryotes show up in the Proterozoic eon
Ozone layer and eukaryotes show up in the Proterozoic eon. Great oxygenation event (oxygen catastrophe). Biology Life is beautiful! From at…
VideoFree10 minutes
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Biology: Molecular structure of RNA
Molecular structure of RNA. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology…
VideoFree12 minutes
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Biology: Plant cell walls
Understanding the structure of plant cell walls. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations t…
VideoFree8 minutes
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Biology: Endergonic, exergonic, exothermic, and endothermic
Endergonic, exergonic, exothermic, and endothermic reactions. Biology Life is beautiful! From atoms to cells, from genes to proteins, from …
VideoFree12 minutes
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Biology: Fertilization terminology: gametes, zygotes, haploid, diploid
How haploid gametes (sperm and egg cells) combine to form a diploid zygote with two sets of chromosomes. Biology Life is beautiful! From at…
VideoFree10 minutes
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Biology: Thomas Hunt Morgan and fruit flies
Thomas Hunt Morgan's pioneering fruit fly work that helped validate the chromosomal theory of inheritance. Biology Life is beautiful! From …
VideoFree11 minutes
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Biology: Carbon 14 dating 2
Carbon 14 Dating 2 Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology is the s…
VideoFree4 minutes
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Biology: Evolution clarification
Clarifying some points on evolution and intelligent design. Biology Life is beautiful! From atoms to cells, from genes to proteins, from po…
VideoFree9 minutes
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Biology: Inflammatory response
Overview of the inflammatory response. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosyste…
VideoFree15 minutes
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Biology: Evaporative cooling
Evaporative cooling. Why sweating cools you down. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations …
VideoFree5 minutes
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Chemistry: Second Law of Thermodynamics
The Second Law of Thermodynamics: there can be no spontaneous transfer of heat from cold to hot. Chemistry Did you know that everything is …
VideoFree10 minutes
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Chemistry: More rigorous Gibbs free energy / spontaneity relationship
More formal understanding of why a negative change in Gibbs Free Energy implies a spontaneous, irreversible reaction. Chemistry Did you kno…
VideoFree14 minutes
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Biology: Phases of meiosis II
How sister chromatids separate to form gametes. Prophase II, metaphase II, anaphase II, telophase II. Biology Life is beautiful! From atoms…
VideoFree11 minutes