Imagine a world in which you can’t lie because, if you do, you will be found out 100% of the time. We obviously don’t live in this world, but we’ve built machines in an attempt to get closer to that reality. So-called lie detectors—a staple of police procedural dramas—are an attempt to suss out the truth of a testimony using science. But is that science real, or is it more of a reflection of a moment in time in history? Join us as we explore the history of lie detectors.