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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: Calorimetry and enthalpy introduction

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Today's episode dives into the HOW of enthalpy. How we calculate it, and how we determine it experimentally...even if our determinations he…

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Electrical engineering: Summing op-amp

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This op-amp circuit outputs the sum of two input voltages. You can do analog arithmetic on signals. Electrical engineering Learn about elec…

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Biology: The scientific method

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How the scientific method is used to ask questions and test explanations. Biology Life is beautiful! From atoms to cells, from genes to pro…

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Biology: 2015 AP Biology free response 6

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Fixing a declining snake population. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems…

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Cosmology and astronomy: Agriculture and human population

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Thinking about how we get Calories from the land limits human population densities Cosmology and astronomy It's a great, big universe out t…

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Electrical engineering: Ben Eater's Spider

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In this video Karl talks to Ben Eater about his improvements to the Spider bot platform. Electrical engineering Learn about electricity, ci…

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Organic chemistry: Fischer projection introduction

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How to assign a configuration to a chirality center using a Fischer projection Organic chemistry Sal and Jay cover topics covered in colleg…

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Electrical engineering: Sign convention for passive components

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The sign convention for passive components defines what we mean by positive and negative voltage and current. Electrical engineering Learn …

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Chemistry: More on orbitals and electron configuration

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How electron configuration is related to orbitals and the structure of the periodic table. Chemistry Did you know that everything is made o…

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Organic chemistry: Newman projections

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Newman Projections Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understanding of basic hig…

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Organic chemistry: Ortho-para directors I

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Regiochemistry. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understanding of basic high s…

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High school biology: Introduction to lipids

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Introduction to lipids like fats and phospholipids High school biology Biological macromolecules There's an old saying, "You are what you e…

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Biology: Bacteria

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Introduction to bacteria. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology i…

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Electrical engineering: Integral of product of cosines

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Definite integral of the product of cosines. The integral of cos(mt) * cos(nt) = 0, except for the special case when m = n. When m = n, the…

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Biology: Chromosomes, chromatids and chromatin

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Overview of DNA transcription, translation, and replication during mitosis and meiosis. Learn about chromosomes, chromatids, and chromatin.…