It's been a long time since I was in grammar school but remember that we were taught a sort of philosophy in the form of nursery rhymes, then the teacher would

It's been a long time since I was in grammar school but remember that we were taught a sort of philosophy in the form of nursery rhymes, then the teacher would later discuss the moral of the story. This definitely didn't get as deep as reading a Ayn Rand novel but was a good introduction to critical thinking.