Light is a truly wondrous phenomenon of nature. In physics light is a well-studied subject, yet there are many misconceptions concerning light's fundamental nature. Some mysteries about light continue to puzzle scientists even today in the 21st Century. But now, in the Final Theory of Light, these puzzles can be resolved and revealed for the first time.

For example, why the speed of light is always constant; why light can never bend, bounce

This is the story of a grand scientific quest: the quest for a unifying theory of nature—one that can explain forces as different as the cohesion inside the atom and the gravitational tug between the sun and the earth. Writing with dazzling elegance and clarity, Nobel Prize–winning physicist Steven Weinberg retraces the steps that have led modern scientists from relativity theory and quantum mechanics to the notion of superstrings and