Scientific exploration can happen anywhere in a classroom full of eager learners. By dedicating time for reflection and planning, teachers can feel empowered to make small changes to classroom spaces to increase their students' scientific experiences. At the museum, teachers believe that by ensuring that the environment is richly stocked with a variety of tools and materials for inquiry, educators can increase the likelihood that informal, child-driven science explorations will happen in their classrooms. Leaders at a nature museum share their knowledge of how to structure a learning environment to guide children's development of science skills. They also created a classroom self-assessment tool for early childhood and early elementary educators to use to determine how well science process skills are integrated into their classroom centers, materials, and curricula. (Contains 2 figures,1 online resource, and an assessment checklist.)