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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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High school biology: Biogeography: Where life lives

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As our planet has coughed up new oceanic islands and ripped its land masses apart, organisms have found themselves stranded in new environm…

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Electrical engineering: Multiplying by j is rotation

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Successive powers of the imaginary unit j correspond to a rotation. Electrical engineering Learn about electricity, circuit theory, and int…

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Health and medicine: Inflammatory bowel disease: Treatment

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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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Health and medicine: Visual cues

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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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Chemistry: Buffer solution pH calculations

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Example of calculating the pH of a buffer solution using the Henderson-Hasselbalch equation, including the pH of the buffer solution after …

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Organic chemistry: Organic chemistry naming examples 3

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Organic chemistry naming examples 3, containing branching and cycles. Organic chemistry Sal and Jay cover topics covered in college organic…

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Organic chemistry: Preparation of acid anhydrides

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How to prepare acid anhydrides from carboxylic acids. Organic chemistry Sal and Jay cover topics covered in college organic chemistry cours…

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Health and medicine: What is hypertension

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Organic chemistry: Common and systematic naming: iso-, sec-, and tert- prefixes

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Common and systematic naming - Iso, Sec and Tert prefixes Organic chemistry Sal and Jay cover topics covered in college organic chemistry c…

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Health and medicine: Defining AIDS and AIDS defining illnesses

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Health and medicine: What is pulmonary hypertension?

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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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Health and medicine: What is HIV and AIDS?

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Organic chemistry: Polymerization of alkenes with acid

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Polymerization of Alkenes with Acid Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understan…

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Health and medicine: Pathophysiology - Type I diabetes

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Health and medicine: Language and the brain: Aphasia and split-brain patients

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Learn about language areas of the brain and the effects of damage to those parts of the brain. By Carole Yue. Health and medicine The medic…