Richard Ambrose explores the history of the telephone. The technology that founded the telephone system consisted of a string and cup. It has radically evolved through fiber optic and computer technology. ➡ Subscribe: http://bit.ly/NatGeoSubscribe About I Didn't Know That: Two industrial scientists, Richard Ambrose and Jonny Phillips, explain the science behind everyday life... from microwave ovens to beating a lie detector. Get More National Geographic: Official Site: http://bit.ly/NatGeoOfficialSite Facebook: http://bit.ly/FBNatGeo Twitter: http://bit.ly/NatGeoTwitter Instagram: http://bit.ly/NatGeoInsta About National Geographic: National Geographic is the world's premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what's possible. History of the Telephone | I Didn't Know That https://www.youtube.com/watch?v=qWUP9EigdjY National Geographic null