An intelligence is the biological and psychological potential to analyze information in specific ways, in order to solve problems or to create products that are valued in a culture.

Kids go to school and college and get through, but they don't seem to really care about using their minds. School doesn't have the kind of long term positive impact that it should.

It may well be easier to remember a list if one sings it (or dances to it). However, these uses of the 'materials' of an intelligence are essentially trivial. What is not trivial is the capacity to think musically.

I think that any important educational goal can be realized via several routes.

What is usually called 'intelligence' refers to the linguistic and logical capacities that are valued in certain kinds of school and for certain school-like tasks. It leaves little if any room for spatial intelligence, personal intelligences, musical intelligence, etc.

As a planet, we are at risk of destruction (for example, gradually by the warming of the planet; or rapidly, by nuclear war or a pathogen that gets out of control). And these threats require us to work together, and not just to announce our diversity.

Hitler didn't travel. Stalin didn't travel. Saddam Hussein never traveled. They didn't want to have their orthodoxy challenged.