Photo Credits
Front cover (clockwise from top left): science teacher in discussion with high school students, Hero Images/Getty Images; girl at microscope, FatCamera/iStockphoto; students conferring at lab bench, asiseeit/iStockphoto; student drawing liquid from a test tube, vasiliki/iStockphoto; school children examining a plant in science class, Hero Images/Getty Images
Pages: 10 sergeyryzhov/iStockphoto; 20 fstop123/iStockphoto; 25 asiseeit/iStockphoto; 31 Bob Daemmrich/Alamy Stock Photo; 41 fstop123/iStockphoto; 57 kali9/iStockphoto; 93 monkeybusinessimages/iStockphoto; 97 Blend Images – KidStock/Getty Images