Book excerpt: Scientists have known for a long time that things move in predictable patterns. It took an apple falling to help further their knowledge, though. We now know how things move and why. Scientists continue to study motion and the forces that cause it, and you can too! In this book, you’ll learn about pushes and pulls and different types of energy. The next time you play soccer, you’ll be able to use your new scientific knowledge to teach your friends and family why that soccer ball moves the way it does.