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Hollywood's biggest stars graced the red carpet on Sunday night for the 83rd annual Academy Awards, one night filled with glamour and glitz.

But while the paparazzi concentrated on the silver-tongued stars of the silver screen, "The King's Speech" - winner of the Oscar for best original screenplay - focused attention on stuttering, a speech impediment that affects millions of people around the globe.

Al Jazeera's Tom Ackerman reports from the US state of Indiana on what researchers have learned about its causes and treatment.

Source: Al Jazeera