TEDTalks Science and Medicine

How I use sonar to navigate the world | Daniel Kish

13:03 | Mar 31st, 2015

Daniel Kish has been blind since he was 13 months old, but has learned to "see" using a form of echolocation. He clicks his tongue and sends out flashes of sound that bounce off surfaces in the environment and return to him, helping him to construct ...Show More