Although that info is really about learning (ways we learn), it concomitantly shows ways to teach, and there is the thing that's important. One of the things we know in the world of education is that most teachers are chalk/talk or aural learners. So, that's the way they teach (because that's the way they learned). When Gardner's work began to gain use and currency, it began to influence the approach teachers took and take in the classroom. In years to come I expect that stats will show higher 'school completion' percentages. It's back to the old saw that "when the only tool you have is a hammer, every problem looks like a nail."