Episode 6 | 54m 41s
Imagine a world without the power to capture or transmit sound. Steven Johnson journeys to the Arcy sur Cure caves in northern France, where he finds the first traces of the desire to record sound. He also learns about the role radio played in the civil rights movement and reveals the Hollywood star who designed a WW2 weapon that would make possible the modern cell phone network.
Expires: 05/08/19Video has closed captioning.