There are some blind people who use echolocation to remarkable degrees. Take for example this boy who's able to rollerblade in the streets, bypassing moving ve

There are some blind people who use echolocation to remarkable degrees. Take for example this boy who's able to rollerblade in the streets, bypassing moving vehicles using echolocation: http://www.youtube.com/watch?v=G1QaCeosUmw http://www.youtube.com/watch?v=G1QaCeosUmw.