Learn about all the sciences, from physics, chemistry and biology, to cosmology and astronomy, across hundreds of videos, articles and practice questions.

Created by experts, Khan Academy’s library of trusted, standards-aligned practice and lessons covers math K-12 through early college, grammar, science, history, AP®, SAT®, and more.

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

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

Chemistry archive Chemistry archive 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 …

In this course you’ll explore the amazing world of biology through topics like biochemistry, cell biology, genetics, evolution, and ecology. To make sure you’re prepared with the fundamentals, we …

Learn high school chemistry using videos, articles, and NGSS-aligned practice. Explore the fundamentals of atomic structure, chemical bonding, chemical reactions, thermochemistry, solutions, …

This course is aligned to the high school Next Generation Science Standards (NGSS). If you’ve mastered this content and want to explore physics at the next level, we recommend our AP Physics …

Sal and Jay cover topics covered in college organic chemistry course. Basic understanding of basic high school or college chemistry assumed (although there is some review).

Get introduced to the major organ systems of the human body! You’ll learn some general anatomy (a roadmap of your body), learn how the arm bone actually connects to ...