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In this science-based storybook, students Anita, Simon, and Dennis want to know why the sky isn't always blue. They learn that there's a lot more than air in the atmosphere, which can affect the colors we see in the sky. Four activities accompany the book. The book is one of a series in the Elementary GLOBE unit designed to introduce students to the study of Earth system science (ESS). Each book has companion learning activities that complement the science covered in each story. Together, the books form an instructional unit that addresses ESS and related subjects (e.g., weather, water, seasons, soil, and aerosols). The GLOBE Program is a worldwide, hands-on, K-12 school-based science education program.