The Learner Characteristic that Leads to Different Learning       Last week, I pointed out that research had found few interactions in literacy learning. That is, research hasn't actually uncovered many situations in which different kinds of kids learn differently—despite many claims to the contrary.       The idea that research would identify important aptitude-treatment interactions has been trumpeted for a long time (Cronbach & Snow, 1977). It just hasn’t panned out, for the most part, when it comes to reading instruction. &nb...