What is sound, on a fundamental level? How did animals evolve to hear? And what happens when you go faster than sound itself? In this episode, we explore the physics of sound with the legendary Bill Nye. 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. Subscribe to Science Rules! wherever you get your podcasts. Get a free one month trial of Headspace at headspace.com/hertz. Get 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. Episode transcript, music, and credits can be found here: https://www.20k.org/episodes/sound101 Learn more about your ad choices. Visit megaphone.fm/adchoices