Science Readers: Content and Literacy: Grade 1 Add-on Pack includes one of each book in the kit (set of 16). Titles include: What Makes a Plant; Inside a Plant; Raising Babies: What Animal Parents Do; Growth and Change; All in the Family; Sound Waves: How Sound Moves; Message Received!; Light Makes a Rainbow; Shadows; Heat: How It Moves; The Seasons; Our Sun; Earth and Moon; Looking Up!; We Recycle; Science Detective.