"The value of students' questions has been emphasized by several authors (e.g. Biddulph, Symington, & Osborne, 1986; Fisher, 1990; Penick, Crow, & Bonnsteter, 1996). Questions raised by students activate their prior knowledge, focus their learning efforts, and help them elaborate on their knowledge (Schmidt, 1993). The act of ‘composing questions’ focuses the attention of students on content, main ideas, and checking if content is understood (Rosenshine, Meister, & Chapman, 1996). The ability to ask good thinking questions is also an important component of scientific literacy, where the goal of making individuals critical consumers of scientific knowledge (Millar & Osborne, 1998) requires such a facility."