Same system as a bat's sonar. Absolutely amazing.
http://www.youtube.com/watch?v=7Q2wZFx7s30
FWIS3
In memory of our guiding lights - Russ, Mike and Charlie - “To be a star, you must shine your own light, follow your own path, and don't worry about the darkness, for that is when the stars shine brightest”
Blind kid see's with sound
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