There was a time in this country when Dads knew more than kids

My kids were watching a TV show in the other room. I heard one of the characters in the show mention that they were going to explore the Mariana Trench. 

"That’s the deepest place in the world," I said. 

"As far as humans know," Clara shouted. "Over 90% of the world’s oceans are unexplored! There could be a deeper spot that we haven't discovered yet."  

"Yeah," said Charlie. "And it’s located in the midnight zone, where no sunlight ever gets. So who knows what's going on down there. We can't see!"

I'm living with a bunch of nerds.