“…Gibb, Fergusson, & Horwood, 2008;Kuhn & Holling, 2009), although exceptions have been reported, for example in physics (Deary, Strand, Smith, & Fernandes, 2007). However, Hattie's (2009) 41 metaanalyses show that the effect of gender is weak-when found at all, it is minor indeed.…”