How many rings are there around Saturn? What causes an earthquake? How many bones are in a giraffe's neck? With Smithsonian Everything You Need to Know: Grades 2-3, kids ages 7-9 will learn exciting and interesting facts about Earth and space, plants and animals, geography, history, and health. Each of the 275 fact cards includes colorful photos and illustrations coupled with a fascinating fact. From the solar system to George Washington to...