Zemeckis uses 3-D to make wire-walker's story 'bigger than life'

Almost as soon as he discovered the story, Robert Zemeckis knew he had to make "The Walk."It was a decade ago when the creator of "Back to the Future," "Forrest Gump" and other blockbusters came across a children's book that illustrated the French acrobat Philippe Petit's historic 1974 high-wire walk between the twin towers of the newly constructed World Trade Center.