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

Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a …

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

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 …

In this course, you'll explore the fascinating world of living things. Learn about cells, organisms, and ecosystems, all while gaining a deeper understanding of your place in Earth's web of life. This course …

In this course, you’ll explore organism growth and development, energy and matter in biological systems, molecular and classical genetics, natural selection and evolution, biodiversity and human …

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 …

Learn AP Computer Science Principles using videos, articles, and AP-aligned multiple choice question practice. Review the fundamentals of digital data representation, computer components, internet …

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 …

NCERT Chemistry Class 11 Some basic concepts of chemistry Structure of atom Classification of elements & periodicity in properties Chemical bonding and molecular structure