A frequent cornerstone of the 9/11 Truther arguments is that WTC 1,2, and the largely unregarded 7 fell because of demolitions. Questions about when the several tons of explosives which would be required were planted are usually shrugged off. As evidence, they point to videos which "clearly" show the towers moving at freefall speed. No, demolitions usually aren't at freefall, but they think they are.
Here's a video to the contrary;

It uses audio analysis to estimate when the buildings fell, and points out that it took much longer than freefall would've taken.
Here are the comments. I'm EGRJ. At a certain point in them, you'll notice someone called SexyMelon. SM declared RKOwens, the guy who made the video, to be "totally incompetent".
( I pounced. )
EDIT: Allow me to summarize another conversation elsewhere;
Suz: Why does the gov't resist an independent investigation that throngs of the public are crying out for?
J: Leaving aside the facts that your "throngs" are a thousand-odd engineers who make up roughly 0.1% of the US population thereof, much less the world's, what's the point of an investigation if Truthers have been able to "determine" exactly what happened just by looking at stuff on the Internet?
Suz: We can't actually know what happened without an investigation.
J: Thank you.
Yeah, it's been a boring few days.
Here's a video to the contrary;

It uses audio analysis to estimate when the buildings fell, and points out that it took much longer than freefall would've taken.
Here are the comments. I'm EGRJ. At a certain point in them, you'll notice someone called SexyMelon. SM declared RKOwens, the guy who made the video, to be "totally incompetent".
( I pounced. )
EDIT: Allow me to summarize another conversation elsewhere;
Suz: Why does the gov't resist an independent investigation that throngs of the public are crying out for?
J: Leaving aside the facts that your "throngs" are a thousand-odd engineers who make up roughly 0.1% of the US population thereof, much less the world's, what's the point of an investigation if Truthers have been able to "determine" exactly what happened just by looking at stuff on the Internet?
Suz: We can't actually know what happened without an investigation.
J: Thank you.
Yeah, it's been a boring few days.