Free Physics Textbook

How do objects and images move? Why do animals move? What is motion? […]

This site publishes a free physics textbook that tells the story of how it became possible, after 2500 years of exploration, to answer such questions. The book is written to be entertaining, surprising and challenging on every page. With little mathematics, the text explores the most fascinating parts of mechanics, thermodynamics, special and general relativity, electrodynamics, quantum theory and modern attempts at unification.

Coolest thing I’ve seen all week.

You can download it by chapter or grab the whole 40 MB pdf in one go.