Gr 8-10–These science-driven collections contain quite a bit more than biographical data. They provide explanations about important discoveries, related work, and social and political influences that impacted the subjects' work. Each book is a compendium of some of the most significant contributors to a particular sphere of science. The approximately six-to-eight page entries include important dates, photographs, diagrams, and sidebars on relevant scientists. The writing is often highly technical and some knowledge of the basics is assumed. Of particular interest are the time lines of both scientific focus and social/political background. The glossaries and resources for further information are exceptional.