`This is a most persuasive book on a most important subject. I recommend it highly.' Saul Bellow With scholarship and clarity, Arthur Zajonc takes us on an epic journey into scientific history. Yet Catching the Light is not just about science; it is a book of ideas that blends science with literature, religion, philosophy, and morality and tries to answer the question that has mystified humanity from pre-history to the present day: what is light?