Children are not aware of limitations. They just figure that if there's something they don't know, it's because they haven't learned it yet.
"Why's the sun round?"
"Because there's a big fire at the center, and as it moves outward, it cools equally."
"Because heat cools at a standard rate."
Children are endlessly curious. It can drive an adult crazy because we are confronted with how little we truly know, and how tenuous our existence is. A child can lead us to an existential crisis in three "Whys?"
~ Alan Watt