“what happened? the story of september 11, 2001” (9 p.m., nickelodeon): “Nick News


September 1, 2011 at 12:00a.m.

“what happened? the story of september 11, 2001” (9 p.m., nickelodeon): “Nick News With Linda Ellerbee” presents a special installment. The veteran newswoman explains the terrorist attacks for children.

tv listings, B6