Explore science with Khan Academy's free courses, videos, and exercises in physics, chemistry, biology, and more for a world-class education.

Khan Academy offers free, world-class education in various subjects including math, science, and arts, aiming to make learning accessible for everyone globally.

Explore biology topics with Khan Academy, offering free resources to learn about cells, genetics, evolution, ecology, and more.

Aug 14, 2025 · Free, high-quality science resources for grades 6–12, including hands-on activities, simulations, and teacher tools—all aligned to NGSS, TEKS, and AP standards.

Teacher resources (TX TEKS Math) Getting ready to teach TEKS-aligned Math courses? You’ll want Khan Academy’s unit guides in your toolkit. Developed by our learning experts, each guide includes …

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Learn how to code computer programs, how to design algorithms that make computers more efficient, and discover what a career in computing could look like.

The chemistry archive contains legacy chemistry content, and is not being updated with new content. For our most up-to-date, mastery-enabled courses, check out Middle School Chemistry, High School …

Learn AP Biology using videos, articles, and AP-aligned multiple choice question practice. Review the fundamentals of biochemistry, cell biology, genetics, evolution, and ecology, and develop scientific …

Learn about electricity, circuit theory, and introductory electronics. We also have sections that let you get down and dirty with household items, from building your own robot to videos where we disassemble …