Lucan’s famous dictum that those standing on the shoulders of giants see farther than the giants themselves applies to no human endeavor more thoroughly than to the “pure” astronomy, chemistry, biology, ge- ology, mathematics, physics, and the many subdisciplines they have spawned. The three volumes of Science and Scientists documents 245 of the mostimportantbreakthroughsinthehistoryofscience,cross-referencedto link those that built on others, from ancient times to the present day. These essaysareaccompaniedbybiographicalsidebarsonmanyofthegiantsbe- hind the discoveries, as well as charts and schematics illustrating many of the basic concepts. The disciplines covered here are broad, including Anthropology, Ar- chaeology, Astronomy and Cosmology, Biology, Chemistry, Computer Sci- ence, Earth Science, Environmental Science, Evolution, Genetics, Mathe- matics, Medicine, Meteorology, Methods, Paleontology, Physics, Psychology, and Space Science. Arranged alphabetically, these essays ad- dress the most important breakthroughs in these fields, ranging from Ab- stractAlgebratoQuantumMechanics,fromtheBigBangtoX-RayAstron- omy, from Antisepsis to Viruses. Accompanying the essays are 125 sidebars highlighting the scientists and their accomplishments. An additional 62 charts, diagrams, and draw- ings illustrate the scientific concepts presented. It is important to note that technological advances and inventions—such as the telephone, the light bulb,andtheairplane—arenotaddressedherebutarecoveredinthecom- panion Magill’s Choice set Inventions and Inventors (2 vols., 2002). How- ever,afew“crossover”achievements—suchasthePersonalComputer,the Internet, and Vaccination—are included in these pages for having had as great an impact on the “pure” sciences as on everyday life. The core achievements in space science also appear here, from the Apollo Moon landing to the International Space Station. Each essay opens with a brief definition of the topic and a summary of itssignificance,followedbyalistofthecentralscientificfigures.Thetextof each essay is broken into sections with concise subheads. “See also” cross- references to other essays in these volumes follow, and each essay ends withalistingofcoreresourcesfor“FurtherReading.”Allessayswerewrit- ten by scholars of history or the sciences.