I am writing a book! If you to know when it is ready (and maybe win a free copy), submit your email on my website: https://www.jeffreykaplan.org/ I won’t spam you or share your email address with anyone. The liar paradox goes back at least to Eubulides, the Ancient Greek philosopher and student of Euclid in the 4th century BCE. That’s the year negative 400. In this lecture video I explain what the liar paradox is and why it just won't go away. I also try to make some jokes about Captain Kirk of Star Trek.