CNN CNN Special Report April 7, 2014 02:40:00
>> no questions? >> no. >> everyone agree? >> my question to paul would be what is the receiver -- they're getting this on receiver. so you wouldn't actually hear this -- would this be something to the human ear? >> that's interesting. you said you can hear it, but it also has a visible -- >> well, you can hear my example. my example was one thousand cycles, well within hearing range. but in actuality, we're looking for something that is about double the human's highest limit of hearing when you're a baby. and it decreases after that. so you would not hear it. but you would see the wave form o...