Explosives were detonated in the North tower to coincide with the apparent plane* explosion in the other.
[And, by the way, more explosions were detonated in Tower 1 as Tower 2 fell]

Carmina Burana
http://www.megaupload.com/de/?d=XNQHSQKL
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thanx Ozzy ;-)  less

Analyzes the explosion sound in an "amateur" video taken of the WTC South Tower crash on 9/11.

See also:
http://killtown.blogspot.com/2007/10/speed-of-sound.html

TinaCart1 footage:
http://www.youtube.com/watch?v=_4JrHfZ5C3w
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(Ver 1):  less

Jeff says: Here is a clip confirming what Joseph Keith had already established - That flight 175 could not have possibly traveled anywhere near 500 MPH at 700ft altitude. Verified by Boeing spokeswoman   more...Leslie Hazzard and Boeing engineer Lori Bechtold.
http://www.pumpitout.com  less