Until I saw this video I thought video fakery was ridiculous
http://uk.youtube.com/watch?v=yjQmxS-DpyM
but this video proves it beyond a shadow of a doubt. You can actually see 30 feet of the gash in the North Tower being pencilled in!
Wow, what an absolute trainwreck of insane gibberish that was.
Some thoughts.
Video maker points to 'top floor explosion'. Sorry, that's where the vent louvres were, it's just smoke going through the vents.
Video maker points to south side explosion and says 'approx 20 stories lower?'. No, sorry. That's called perspective.
See how the top of the south tower looks much lower than the top of the north tower? That's because it's further away from the viewpoint. The south side explosion is blasting out a fair distance south of the tower, hence is further away than the north side, so will look lower.
This is basic stuff.
Video maker points to a 'secondary explosion'. Nope. All I see is fire being excited by a considerable updraft of exploding fuel directly above it.
Video maker says 30% of the tower wall is intact after impact. Impossible claim, since most of what he claims as intact is in fact in the shadow of the explosion and too obscured to make any valid judgement.
Video maker points out the 'gash'. It's not a gash. It's just smoke! Plane hits building, releases fuel inside and ignites it, fuel spreads and starts burning. Fire creates smoke, smoke exits building. Do you follow?
Video maker than points us to news footage of the tower much later on, but fails to show other images shot at the same time, such as those posted above by Slayhamlet, which prove the 'gash' is nothing more than smoke from an early jet fuel fire which obviously died down later.
Conclusion: video maker is an insane idiot. Why are you wasting our time by posting this garbage? This is trash. Stop making a fool of yourself.