On Nov. 18, 1995, Itzhak Perlman, the violinist, came on stage  to give a concert at Avery Fisher Hall  at Lincoln Center in New York City.  If you have ever been to a Perlman concert, you know  that getting on stage is no small achievement for him. He was stricken with polio as a child, and so he has braces on both legs and walks with the aid of two crutches. To  see him walk across the stage one step at a time, painfully  and slowly,…..

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