Designed to present interesting facts about science and to heighten the curiosity of primary age students, this book contains activities about the natural world and numerous black and white illustrations. The first section focuses on trees and investigates types common to all states and climates. A tiny seed mascot, known as Ollie Acorn, introduces the children to various characteristics of the trees with picture fill-ins, songs, games, and experimental projects. A section is also included on animals and their interdependence with plants. Directives for the individual activities are provided in the teacher/parent guide section and include: (1) discussion questions; (2) explanations of the learning activities with answer key; (3) vocabulary list; and, in most cases, (4) extended activities. (ML)