n the beginning there was light but more than this, there was gravity. After that, all hell broke loose... This is how the story of the greatest intellectual adventure in history should be introduced - how humanity reached its current understanding of the universe, one that is far removed from the realm of everyday experience. Krauss connects the world we know with the invisible world all around us, which is removed from intuition and direct sensation. He explains our current understanding of nature and the struggle to construct the greatest theoretical edifice ever assembled, the Standard Model of Particle Physics -- and then to understand its implications for our existence. Writing in the critically acclaimed style of A Universe from Nothing, Krauss celebrates the beauty and wonders of the natural world and details our place within it and how this shapes our understanding of it. Krauss makes this story accessible through profiles of the scientists responsible for these advances, and clear explanations of their discoveries. Krauss takes us on a tour of science and the brilliant personalities who shaped it, often against political and religious indoctrination, enduring persecution and ostracism. Krauss creates a captivating blend of research and narrative to invite us into the lives and minds of these figures,creating a landmark work of scientific history.