Gr 5-8--Despite the titles, and although this series offers sidebars with biographical information on key players and interesting facts about them, it covers more science than biography. However, these are excellent books with a good balance of text and images, and they offer concise and clear presentations of sometimes-complex topics. Natural Selection, for example, discusses the workings of Darwin's theory and other related science, and ends with information on genes and DNA. Atom discusses the breakthroughs in physics and chemistry that led to the development of nuclear weapons and nuclear power and includes a photograph of Belarussian protestors in radiation masks on the Chernobyl anniversary. Purchase where new titles are needed on these topics.[Page 69]. (c) Copyright 2010. Library Journals LLC, a wholly owned subsidiary of Media Source, Inc. No redistribution permitted.