This expanded second edition offers a rich collection of 35 design challenges for children ages 3 - 8, featuring both updated favorites and brand new activities. It also includes a curated list of 140 picture books that inspire STEM-focused exploration while reflecting the diverse experiences, interests, and identities of young learners. Educators will find enhanced foundational content, including clearer connections among tinkering, making, and engineering; updated terminology aligned with current research on how children learn; and practical guidance on observing, documenting, and assessing learning. A customizable planning template for creating your own design challenges is also available online. With this hands-on resource, you can harness children's natural curiosity and creativity to spark meaningful STEM discovery and learning through play.