Scientists work in all different fields, but they have one thing in common: they ask lots of questions. Readers will learn about different kinds of scientists, from geologists to marine biologists. They'll learn how scientists ask questions, make guesses, test them, and share what they've learned. This book shows scientists working in the field and in the lab. Readers will learn how to become a scientist and how scientists make a difference. Photographs and accessible text are paired to give readers a comprehensive look at this exciting career.