Motion Mountain – The Free Physics Textbook

How does a rainbow form? Is levitation possible? Do time machines exist? What does ‘quantum’ mean? What is the maximum force found in nature? Is ‘empty space’ really empty? Is the universe a set? How does one empty a bottle as rapidly as possible? What are the highest force and power in nature? How does one connect water pipes to a turning wheel? What are the dangers of a can of beans? What is the single page of unsolved problems in fundamental physics?

A free, extremely comprehensive (40Mb d/load) physics book will hold the answers. Just fantastic.