From making an earthworm farm to launching a plastic bottle rocket, here's hours of fun for curious kids ages 8 to 12. Plus, kids learn a lot of science with the 250 simple-to-perform activities in this book. In half an hour or less, using only readily available materials like bottle caps and liquid detergent , kids can try experiments that demonstrate real laws of chemistry and physics, principles of animal and plant biology, geology, meteorology (the study of weather), and astronomy. This well-illustrated, best of the best collection from McGraw-Hill's popular "Science for Kids" series also gives kids help putting together a science fair project.