Science
Biology
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Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology is the study of the fascinating and intricate systems that make life possible. Dive in to learn more about the many branches of biology and why they are exciting and important.
Covers topics seen in a high school or first-year college biology course.
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Health and medicine
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The medical world can be a confusing place. Patients, their families, and even students entering health fields might feel overwhelmed by the large vocabularies and complicated explanations. We hope to make understanding the medical world a bit easier. Look around!
These videos do not provide medical advice and are for informational purposes only. The videos are not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have
regarding a medical condition. Never disregard professional medical advice or delay seeking it because of something you have read or seen in any Khan Academy video.
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A brief introduction to biology
Biology, defined as the scientific study of life, is an incredibly broad and diverse field. In many ways, it's as kaleidoscopic and rich as living organisms themselves. Biologists study life at many scales, from cells to organisms to entire ecosystems. Begin your own biological journey here!
Start learningA brief introduction to biology
Biology, defined as the scientific study of life, is an incredibly broad and diverse field. In many ways, it's as kaleidoscopic and rich as living organisms themselves. Biologists study life at many scales, from cells to organisms to entire ecosystems. Begin your own biological journey here!
Start learningFeatured biology videos
A brief introduction to physics
Physics is the study of the basic principles that govern
the physical world around us. We'll start by looking at
motion itself. Then, we'll learn about forces, momentum,
energy, and other concepts in lots of different physical
situations. To get the most out of physics, you'll need a
solid understanding of algebra and a basic understanding
of trigonometry.
Start learningA brief introduction to physics
Physics is the study of the basic principles that govern
the physical world around us. We'll start by looking at
motion itself. Then, we'll learn about forces, momentum,
energy, and other concepts in lots of different physical
situations. To get the most out of physics, you'll need a
solid understanding of algebra and a basic understanding
of trigonometry.
Start learningFeatured physics videos
A brief introduction to chemistry
We will be covering the material in a first year
introductory high school or college general chemistry
course. This may be your first time taking chemistry, but
chances are you know a lot of chemistry already from
observing the world around you. We will learn how to
explain phenomena by thinking in terms of the atoms that
make up all matter, and how atoms interact. Basically,
learning chemistry is like having telescopic vision!
Start learningA brief introduction to chemistry
We will be covering the material in a first year
introductory high school or college general chemistry
course. This may be your first time taking chemistry, but
chances are you know a lot of chemistry already from
observing the world around you. We will learn how to
explain phenomena by thinking in terms of the atoms that
make up all matter, and how atoms interact. Basically,
learning chemistry is like having telescopic vision!
Start learning