THE NEXT WI-FI by Dr. Harald Haas of the University of Edinburgh
Here's the situation: our 5 billion mobile phones transmit 6 petabytes of data every month. We're running out of the radio frequencies that are used for wi-fi and cellular networks. Like many other great inventors, Haas developed a solution using things we have in abundance: chiefly the world's 14 billion lightbulbs. His system implants electronics in ordinary lightbulbs and uses subtle changes in light intensity to transmit data. It's fast, and since light doesn't go through walls, it's secure.
Source : http://edition.cnn.com/
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