51.   The message reached Ganci about a minute before the south tower collapsed.

52.   The picture of what took place inside the two towers from the moment the first plane hit until the awful collapse of the south tower is continuing to emerge.

53.   The plane went down and straight into the south tower.

54.   The remains were uncovered where the south tower had stood.

55.   The south tower was also hit at a lower point, meaning there was more weight bearing down on the damaged floors.

56.   The south tower shook, seemed to list in one direction and then began to come down, imploding upon itself.

57.   The south tower collapsed less than an hour later.

58.   The south tower starts falling.

59.   The studies may also explain why the south tower, struck second, fell first.

60.   The technology of a networked world meant that scores of television cameras would be trained on the south tower, to capture the horror of the delayed second impact.