This is a movie of the collapse of the South Tower of the World Trade Center taken with a hand-held camera. In the original video, the camera is moving wildly, so the details of the collapsing building are hard to see.

To make it easier to study the details of the collapse, I separated the movie frame-by-frame and wrote a program to transform the images in such a way that the image of the building remains fixed, even though the camera is moving. I then reassembled the sequence of still frames into a slow-motion version of the movie. For more, see http://www.911SpeakOut.org.
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[David Chandler is a member of Architects and Engineers for 9/11 Truth: http://www.AE911Truth.org ]
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(I have disabled comments because You Tube videos supporting 9/11 demolition theories are being systematically flooded by abusive comments that discourage rather than promote civil discourse.) (less info)