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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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Health and medicine: Precocious puberty

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At Stanford Medical School with Morgan Theis talking to Dr. Laura Bachrach talking about precocious puberty Health and medicine The medical…

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Electrical engineering: Complex exponential magnitude

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A closer look at the complex exponential term in Euler's Formula. We see that it represents a complex number, a distance of 1 from the orig…

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Class 11 Physics (India) - Hindi: Introduction to Momentum (Hindi)

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What is momentum? A simple problem involving momentum. Class 11 Physics (India) - Hindi To help students who prefer to learn by watching Hi…

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Health and medicine: What is bacterial vaginosis?

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Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-p…

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Class 11 Physics (India): Conservative forces

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A conservative force exists when the work done by that force on an object is independent of the object's path. Instead, the work done by a …

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Health and medicine: Diagnosis, treatment, and prevention of syphilis

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Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-p…

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Electrical engineering: RC step response example (3 of 3)

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An example solution of an RC step response, with real component values. Electrical engineering Learn about electricity, circuit theory, and…

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Health and medicine: Compensation and decompensation in heart failure

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Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-p…

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Class 12 Physics (India): Magnetic force on a proton example (part 1)

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Sal does an example problem to determine the size and direction of the magnetic force on a proton moving through a magnetic field. Class 12…

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Class 11 Physics (India): Basic derivative rules

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Once you know how to take the derivative of x^n, it turns out you can take the derivative of any polynomial. Let's see why... Class 11 Phys…

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Health and medicine: What's in sweat? (Holocrine, Apocrine, Merocrine Glands)

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Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…

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Class 11 Physics (India): Finding torque for angled forces

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David explains how to determine the torque exerted by a non-perpendicular force. Class 11 Physics (India) Let's learn, practice, and master…

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Electrical engineering: Fun with Spider Bot

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Electrical engineering Learn about electricity, circuit theory, and introductory electronics. We also have sections that let you get down a…

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Health and medicine: Risk factors for drug use and drug abuse

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Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-p…

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Class 11 Physics (India): Derivation of beat frequency formula

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In this video David derives the formula for beat frequency. Class 11 Physics (India) Let's learn, practice, and master topics of class 11 p…