Collapse footage, witness testimony, and common sense all indicate that the Twin Towers were deliberately demolished with explosives.
Note how no debunkers ever address the oral histories of 503 first responders which taken as a whole offer strong corroboration to the controlled demolition hypothesis.
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Props to mkultra.tv for the montage set to the remix of Coldplay's Clocks, and to Jim Hoffman's websites 911research.wtc7.net and 911review.com for most of the concluding analysis.
LEARN THE TRUTH THEN GET OFF THE COMPUTER AND DO SOMETHING ABOUT IT.
Errata: The audio on the clip starting at 1:20 was apparently fabricated, added on for some TV documentary.