My Grampa is really, really smart...

We were wandering around the Baltimore Aquarium together, and he asked me a question. "Sadie" he said, "What percentage of the Earth is water?" So, I thought about it.

And thought about it.

I knew there was a lot of blue stuff on my atlas at home, but I didn't know what percentage it was.

Then Grampa said, "It's over 70%!!!"

I did not know that.

I'll have to remember that when I'm on Jeopardy someday.