The gripping story of the most important overlooked commodity in the world—sand—and the crucial role it plays in our lives.Except for water and air, sand is the natural resource that we consume more than any other—more than oil, more than natural gas. Every concrete building and paved road on Earth, every computer screen and silicon chip, exists because of sand. From Egypt's pyramids to the Hubble telescope, from the world's tallest skyscraper to the sidewalk below it, from Chartres' stained-glass windows to Chihuly sculptures to your iPhone, sand shelters us, empowers us, engages us, and inspires us. It's the ingredient that makes possible our cities, our science, our lives—and our future.And we're running out of it.The World in a Grainis the compelling true story of the hugely important and diminishing natural resource that grows more important every day, and some of the people who use it, sell it, recycle it, and destroy it....