In this fourth and final book in the series about seasons, Wendy Pfeffer turns her attention to summer, when butterflies emerge from silky cocoons and daylight hours stretch longer and longer. With lyrical prose and vibrant illustrations, The Longest Day takes us on a journey through the history and science behind the summer solstice, with a focus on summer celebrations from various cultures around the world. Teachers and students alike will treasure the varied and accessible knowledge, and activities in the back let everyone in on the festivities.