Students in this pilot study who participated in PBL showed evidence of collateral learning. In his book Democracy and Education, Dewey (1966) states that, “We never educate directly, but indirectly by means of the environment” (p. 19). Through the PBL environment, students were indirectly challenged to reevaluate their scientific stereotypes. Previous research has documented the difficulty in changing students’ stereotypical images of scientists as “white males in lab coats” (Buck, Leslie-Pelecky, & Kirby, 2002; Finson, 2003). The results of the Draw-a-Scientist Test indicated that the PBL experimental group had fewer stereotypical images of scientists at the end of the unit. In addition, a greater percentage of the PBL experimental group viewed themselves as scientists than the comparison group. This change in perception may be an indirect, but important, result of engaging students in authentic scientific tasks and in authentic scientific roles. Broadening students’ images of scientists is a first step toward encouraging them to take the initiative to further their study of science, and it enables them to envision themselves in a science-related career. Although the numbers in this pilot study are small, this finding could be of importance, particularly in a population of students who are not often exposed elsewhere to a wide variety of role models and career options in the sciences.