Daniel Kish has no eyes. He lost them to cancer at just 13 months of age, but you wouldn’t be able to tell from watching him. The 44-year-old happily walks round cities, goes for hikes, rides mountain bikes, plays basketball, and teaches other blind youngsters to do the same.
by (http://blogs.discovermagazine.com/notrocketscience/2011/05/25/the-brain-on-sonar-%E2%80%93-how-blind-people-find-their-way-around-with-echoes/)
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