Children's ideas concerning natural phenomena often differ from those of scientists, and these ideas are termed as alternative conceptions. The prevalence of alternative conceptions is highest among young children who possess less experience with the natural world as compared with adults. Children's ideas about micro-organisms are of special…

The Naglieri Nonverbal Ability Test (NNAT) is said to be a culturally neutral measure of ability that assesses both majority and minority students equally. Although research has examined the effects of ethnicity and gender on NNAT performance, little published research has examined the relationship between socioeconomic status (SES) and NNAT…

Much interest exists among parents and researchers regarding the benefits and drawbacks of delaying kindergarten entrance to acquire academic advantage ("redshirting"). How evident is this assumed advantage at the kindergarten level and beyond? The authors evaluated large-scale test data from Grades K-8 to investigate the difference in performance…