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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: Iron deficency anemia diagnosis

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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 lung cancer?

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Lung cancer is a disease where cells in the lungs multiply uncontrollably. The extra cells take up space in the lungs and impair gas exchan…

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Health and medicine: Theories of Emotion

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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: Blood conditions in pregnancy

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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: What is contractility?

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Contractility tells us how many myosin heads are working at the end of systole; a number that goes up or down with the level of sympathetic…

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Health and medicine: Henry's law

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Explore the relationship between partial pressure of a gas and the concentration of the gas molecule within a liquid. Rishi is a pediatric …

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Biology: Intelligent design and evolution

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The argument that evolution speaks to being the most "intelligent design." Biology Life is beautiful! From atoms to cells, from genes to pr…

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High school biology: Introduction to experimental design

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Introduction to experiment design. Creating a hypothesis. Double-blind testing. Placebo effect. High school biology Biology and the scienti…

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Health and medicine: Pulmonary hypertension diagnosis

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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: Endocrine system and influence on behavior - Part 1

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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: Ebstein's anomaly

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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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Biology: Carbon as a building block of life

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Carbon as a building block of life. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems,…

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High school biology: Example identifying roles in a food web

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Example identifying roles in a food web High school biology Trophic levels Topic: Science Learn about all the sciences, from physics, chemi…

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Biology: Understanding and building phylogenetic trees

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Learn how to read and draw phylogenetic trees, or cladograms. Biology Life is beautiful! From atoms to cells, from genes to proteins, from …

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Health and medicine: Aldosterone removes acid from the blood

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See how Aldosterone acts on the alpha-intercalated cell to remove protons (acid) from the blood. Rishi is a pediatric infectious disease ph…