The Long-Range Acoustic Device, or LRAD, was developed for the military for long-range communication at sea. But this ear-splitting device has also been fired on protesters across America, resulting in lawsuits and permanent hearing loss. In this episode, we explore the history, science and effects of the so-called “sound cannon.” Featuring tech journalist Lynne Peskoe-Yang and activist Michele Lindor.

Follow the show on Twitter, Facebook, & Reddit.Subscribe to our Youtube channel here.Become a monthly contributor at 20k.org/donate.If you know what this week's mystery sound is, tell us at mystery.20k.org.Check out Lynne’s work at lynnepeskoeyang.comGet a 4-week trial, free postage, and a digital scale at Stamps.com. Just click the microphone at the top right corner and type the promo code 20k.Compare home and car insurance rates at policygenius.com.Episode transcript, music, and credits can be found here: https://www.20k.org/episodes/thedeterrenttoneLearn more about your ad choices. Visit megaphone.fm/adchoices