Did you ever walk through a wall or drink a glass of blocks? Have you ever played with a lemonade doll, or put on milk for socks?This latest addition to the Let's-Read-and-Find-Out Science series introduces young readers to an important science concept: the differences between solids, liquids, and gases. Any child who wants to know why she can't walk through a wall will enjoy Kathleen Weidner Zoehfeld's simple text and Paul Meisel's playful illustrations.