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Sine and cosine can be generated by projecting the tip of a vector onto the y-axis and x-axis as the vector rotates about the origin. Elect…

Plate Tectonics -- Geological Features of Divergent Plate Boundaries Cosmology and astronomy It's a great, big universe out there. In this …

Overview of the light-dependent reactions, including the structure of the chloroplast, the photosystems, and how ATP is synthesized. Biolog…

Integrating sin(mt) and cos(mt) over a full period equals zero. Electrical engineering Learn about electricity, circuit theory, and introdu…

How to balance a redox reaction in base. Chemistry Did you know that everything is made out of chemicals? Chemistry is the study of matter:…

In this video we compare our hair dryer motor to the motor we built. Electrical engineering Learn about electricity, circuit theory, and in…

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

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

More detailed description of the various molecular actors in the light dependent reactions. Biology Life is beautiful! From atoms to cells,…

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

Introduction to pH and the pH scale. Examples of calculating pH of pure water, bleach, and orange juice. Chemistry Did you know that everyt…

Energy necessary to recycle aluminum from aluminum oxide. From 2015 AP Chemistry free response 7. Chemistry Did you know that everything is…

Supermassive Black Holes Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll learn about …

High school biology The reproductive system Topic: Science Learn about all the sciences, from physics, chemistry and biology, to cosmology …

Introducing the diode as a circuit element. A diode conducts current in one direction but not the other. Electrical engineering Learn about…