Xploration Earth 2050 - Season 3 Episode 1 Future of Sound

Sound--you don't think much about it, but futurists and entrepreneurs do. Host Chuck Pell catches up with two college-age inventors who've created a fire extinguisher that puts out fires--with sound waves. Another inventor has created a 'sound cloaking' device that could make submarines invisible to sonar. And sound waves can also be used to defy gravity--provided you can generate enough noise.