It takes some people a lifetime to learn what a 3 year old knows

Ignorance is a bliss.
The less you know, the happier you are, the easier you think things are.

it gets more unnerving when the number of things hits double digits, i'm speaking from experience.

"My wife just died."
"That's only ONE thing."

That’s like a teacher saying there are only 2 problems, but hen they have 20 parts each