How does GPS know where you are?
Without GPS, we\u2019d be lost. Literally. Thanks to these radio transmissions from space though, we\u2019re able to pinpoint our location and find our way home. Join us as we learn all about satellites, how the robot voice of GPS is created and how atomic clocks hold it all together. Plus a mystery sound and a brand new Moment of Um answers the question: "What is light made of?" Today's episode is sponsored by Kind Snacks (KindSnacks.com/BRAINS), Vamousse (vamousselice.com) and Roshambo Baby (roshambobaby.com and offer code BRAINS).