Science is constantly changing in exciting ways, and these entries in the Science Frontiers series show children the direction in which some scientists are headed. Covering topics that are current and relevant, the engaging text begins with an overview and continues with double-page spreads that introduce related issues and scientific discoveries. Saving Endangered Species discusses why animals become endangered and the programs and technologies scientists employ to protect them, such as cameras in rhinos' horns to capture poachers and "frozen zoos" of endangered animals' cells. Accompanying each double-page spread are color photos and numbers-based statistics. An additional fact sheet and glossary round out these volumes. A useful series for beginning research and high-interest browsing.