21.   And without a frame changed, including a handful of shots in which the no-longer-there twin towers of the World Trade Center are visible.

22.   Anthropomorphism is irresistible when contemplating twin towers, as the term itself suggests.

23.   As a result, almost nothing remains above ground across an area where the twin towers and five other World Trade Center buildings once stood.

24.   As news of the disaster spread, students awaited word from their friends and professors who live and work in buildings near the twin towers.

25.   As they worked, Cheney and Rice, still in the tunnel command center, saw the horrifying collapse of the second twin tower.

26.   At first, I used a silly, gingerly phrase, telling Adam that a plane had bumped into the twin towers.

27.   At night, the Philadelphia skyline glows with red, white and blue lights atop the twin glass towers of Liberty Place.

28.   Better lighting in stairways in the twin towers certainly saved lives.

29.   Billions of dollars hang on the question of whether the destruction of the twin towers by two jetliners was one insurable event, or two.

30.   Bin Laden and his agents took down the twin towers, destroyed part of the Pentagon, and killed thousands in New York City, Washington, and Pennsylvania.