Uncover the brilliant science of light - how it affects our wellbeing, shapes our lives, and illuminates the universe. From the initial formation of photons deep inside the sun to the illumination with which you are reading these words, there is no part of our universe that has not been transformed by light. Since it is so universal, light is often overlooked as a key force in our lives, which has the potential to both enrich and damage us. In this groundbreaking book, Russell Foster, Professor of Circadian Neuroscience at Oxford University, brings this immense energy back to the centre of our thinking. He uncovers the cutting-edge science behind how light shapes our vision, regulates circadian rhythm, alters our mood and transforms our lives. From the animal kingdom to working night shifts, this expansive and illuminating book offers a newfound appreciation and understanding of the limitless power of light, and how it can be harnessed for our health and wellbeing.