Looking down the barrel of a gun is a transforming experience - particularly for an African-American teenager in the South during the civil rights movement.
      "It felt like an eternity," said U.S. Magistrate Judge John A. Houston.
      Houston had chosen to attend a recently integrated school across town in his native Greensboro, N.C. Walking home one afternoon, he was stopped by a carload of white men. A man in the back seat pulled out a gun.
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