Innovation

One-Way Sound Transmission


Innovator: Andrea Alù  
Age: 35 
Professor of electrical and computer engineering, University of Texas at Austin

Form and function: Sound waves tend to travel every which way, meaning if you can hear something, you can usually be heard. This acoustic circulator focuses sound waves so they travel in one direction and blocks them from moving back.

Cwinter
Winter is a reporter for Bloomberg Businessweek in New York.

Steve Ballmer, Power Forward
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