Book excerpt: This collection explores the broad landscape of current and future out-of-school science learning environments. Written by leading experts and innovators in informal science learning, these thoughtful and critical essays examine the changing nature of informal institutions such as science museums, zoos, nature centers, planetariums, aquaria, and botanical gardens and their impact on science education. The book examines the learning opportunities and challenges created by community-based experiences including citizen science, makerspaces, science media, escape rooms, hobby groups, and gaming. Based on current practices, case studies, and research, the book focuses on four cross-cutting themes – inclusivity, digital engagement, community partnerships, and bridging formal and informal learning – to examine how people learn science informally. The book will be of interest to STEM (science, technology, engineering and math) educators – both in and out of school – designers of science and experiential education programs, and those interested in building STEM learning ecosystems in their communities.