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...