As blind people can testify, we humans can hear more than one might think. The blind learn to navigate using as guides the echoes of sounds they themselves make. This enables them to sense the locations of walls and corners, for instance: by tapping the ground with a stick or making clicking sounds with the tongue, and analyzing the echoes reflected from nearby surfaces, a blind person can map the relative positions of objects in the vicinity... via Health News from Medical News Today Read More Here..
Lake forest health and fitness http://healthandfitness1blog.blogspot.com/2013/09/people-can-acquire-capacity-for.html
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