Out of Sight! is an explorer's guidebook for excursions into elusive and invisible worlds that cannot be experienced directly with our senses. It is a popular introduction into modern natural science that provides insight into the advanced and expensive technology required to explore universes too small for the eye to see. These are the domains of cells, on which all life is based, and quarks, atoms, and molecules, the basic building blocks of matter. This book explains, in nontechnical language, how we obtain our knowledge of the micro-universe. With the help of many clear diagrams, it describes the structure of living cells, atoms, and molecules as they are found in everyday objects, as well as in more exotic and dramatic forms of matter, such as antimatter, stars, and black holes.