There are over 20-billion connected wireless devices in the world today. So right now, whether you’re sitting on your couch or on your way to work, there are likely dozens of invisible WiFi signals all around you. But what if we didn’t get our data from WiFi routers?

In this episode, filmmaker Alexandra Dean tells the story of Hollywood starlet Hedy Lamarr and how she invented what became the basis for WiFi and wireless communication. Then Harald Haas explains how he’s reinventing wireless communication by turning light bulbs into wireless transmitters or, as he calls it, LiFi.