Folk guitarist plays 3 chords for the 1000 listeners, the jazz guitarist plays 1000 chords for 3 listeners, rock guitarist in the studio plays for himself ... and excellent!

Trey Alexander at True Fire Studios

What if light bulb could also transmit data? At TEDGlobal, Harald Haas demonstrates, for the first time, a device that could do exactly that. By flickering the light from a single LED, a change too quick to for the human eye to detect, he can transmit far more data than a cellular tower, and do it in a way that’s more efficient, secure and widespread. (Recorded at TEDGlobal 2011, July 2011, in Edinburgh, Scotland. Duration: 12:52.)