It happens every day across the nation: Teachers welcome their students to class by saying, "Good morning, boys and girls." It is one of countless ways teachers highlight gender with their speech and behavior. Unfortunately, teachers' use of gender to label students and organize the classroom can have negative consequences. New research in the field of child psychology suggests that teacher behaviors can play an important role in shaping their pupils' gender attitudes. Although this general conclusion is not necessarily surprising, "which" behaviors are important often surprises teachers. As a first step, classroom teachers should avoid making statements such as, "The girls are doing a good job," or, "The boys need to be a bit quieter." This will help all children concentrate on their identity as "students" rather than as members of a gender group. Mentioning sexism (and racism and other -"isms") is important. Children who understand the environmental factors that lead members of social groups to perform different roles are less likely to explain these differences in terms of innate characteristics--"white men are better leaders"--and will, therefore, be less likely to embrace or accept gender stereotyping and bias. Which can lead to a new morning greeting: "Good morning, students!"