NASA's Innovative Advanced Projects grant program funds individuals developing unique and daring space technologies, and the Out of This World series (8 new titles) introduces readers to some of these scientists, providing engaging biographical profiles and descriptions of their work. Leaping Low Gravity Explorers introduces Marco Pavone and his cubical Hedgehog rover, a data-collecting device meant to tumble over rough terrain while maintaining traction in low-gravity environments, like on asteroids. The books follow a similar format, with topics presented in two-page spreads filled with vivid fonts, quotes, and attention-getting full-color photos. Each volume features brief paragraphs and accessible language, ample technical background, biographical details, and pop-culture references (Star Trek, Lost in Space, The Martian), plus the cutting-edge technology should capture and keep the attention of readers.

Gr 4--7--Meet eight inventors and learn about the cutting-edge innovations they are working on in this series about projects that are funded by the NASA Innovative Advanced Concepts program. The NIAC program supports the development of new space technology, and this series packs in a lot of information about the unique problems of living in space, exploring Mars and Venus, and protecting humans and spacecraft from dangerous conditions while explaining the advances in STEM fields that are trying to solve these problems. The design of the book, with many large graphics dominating spreads and text blocks in manageable chunks, makes the material easier to process. Four "inventor features" in each title humanize the scientists. A glossary, "inventor challenge," and index are included. VERDICT Recommended for upper elementary and middle school space buffs.