The difference between a fact and an opinion is, well, topical these days. And it’s become increasingly apparent in recent years that it’s a tough concept even for some adults—let alone kids—to grasp.

It’s the childhood whine heard around the world: “That’s not fair.” It’s used in protest to a sibling being allowed to stay out with friends or have extra screen time, or in response to a classmate ...

A few weeks ago, my daughter asked a close friend of hers to hang out after school. Her friend declined the invitation and said she had a doctor’s appointment. As it turned out, there was no doctor’s ...