For Slate, I wrote an essay about how I waste time by spotting liars in clips on YouTube.

It all started with a click on a YouTube talk by former CIA Officer Susan Carnicero. As I watched, riveted, Carnicero went over how to tell whether someone is lying. When asked a question, she explained, a person’s behavior will betray their dishonesty within five seconds. They shake their heads no when making a positive statement or nod yes when denying something. They get angry or display inappropriate levels of concern. They repeat questions or avoid direct answers. They smirk or avert their gaze. Taken alone, these behaviors may indicate other emotions, like anxiety or shyness, but if two or more appear—a cluster, Carnicero called it—then you may have a liar on your hands.

“When you finish this 45 minutes with me, you’re going to know just enough to be dangerous,” Carnicero said. She was right. I gleefully applied my newfound knowledge to dozens of online clips of politicians, murder suspects, and celebrities.

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