Which thing didn't you know? :)

Thing 1 and Thing 2!

But seriously, I did not know

 7. He gifted the English language with “nerd” and redefined “grinch.”

In 1950’s “If I Ran the Zoo,” a kid rattles off a list of fantastical creatures that rival the animals found in the zoo: “I’ll sail to Ka-Troo and bring back an It-Kutch, a Preep, and a Proo,/A Nerkle, a Nerd, and a Seersucker too!”

In the book, a sign identifies a “nerd” as a red and yellow and white-haired sourpuss. It appears to be the first documented instance of the word, which has since morphed into a put-down for bookish people.

Writing for The Boston Globe, Ben Zimmer said the word “nerd” has no one particular historical source, but it is a credible theory that Seuss played a role in popularizing it.

And while Seuss didn’t invent “grinch,” the word’s meaning — a grouchy person — is all him, Nel said.

“He actually changed the language,” Nel said. “There are poets that do that, but it’s not common.”

“Nerkle,” however, has yet to catch on.

He invented nerd?!

He didn't invent grinch?!

Whoa. Cool.