Hypersonic Sound

This is by far the coolest technology I have found yet! To start, lets talk about the light bulb. At the beginning of its life the light went where ever it wanted. As time went on, people added reflectors and were able to completely focus that light. Now imagine sound, what if sound could be focused. This could be used everywhere!!! Advertisers could use this at supermarkets to play ads or people could use it in their cars to listen to different things at the same time just to name a few. To get all the details on how this works and hear the inventor talk about this creation go to the following link:

http://www.ted.com/talks/woody_norris_invents_amazing_things.html