Jirout and Klahr (2012) were interested in understanding how to characterize and study curiosity in children. In their article, they note, "Although curiosity is an undeniably important aspect of children's cognitive development, a universally accepted [way to measure] curiosity does not exist" (Jirout & Klahr, 2012, p. 125). What type of definition, according to these authors, is needed for the term curiosity?