Fascinating article! I have a great uncle who was a blind marathon runner. He used a guide and I wonder how he would have done if he had learned how to echoloca

Fascinating article! I have a great uncle who was a blind marathon runner. He used a guide and I wonder how he would have done if he had learned how to echolocate. http://wwuvikings.cstv.com/sports/c-track/spec-rel/082108aaa.html http://wwuvikings.cstv.com/sports/c-track/spec-rel/082108aaa...