Four Things That Do Not Exist

The past few years have brought about torrents of disinformation, have cast doubts on all science and education, sown mistrust in long-established institutions, and severly eroded our abilities to tell fact from fiction. In spite of all that, I do know of four things that do not exist:
Flying pigs
Hen teeth
Unicorns
Congressional republicans telling the truth.
I welcome any objectively verifiable claims to the contrary.

–Richard Ackerman, Castro Valley