You see, there were some people standing around Building 7 taking videos with their cameras. Before the East Penthouse caved in, the cameras recorded some loud rumbling sounds. Play this video and listen real closely for the low "boom" sound before the East Penthouse caves in.
https://www.youtube.com/watch?v=nqbUkThGlCo
Also, this nice man listened real closely to another video of the collapse of Building 7 and found that you can hear the exact same rumbling sound before the East Penthouse caved in:
https://www.youtube.com/watch?v=ERhoNYj9_fg
One man named "Deryll" that was hundreds of feet away from the building said on the radio that he heard something that sounded like a "clap of thunder" before the entire thing fell to the ground. So, of course, there must have been some really heavy stuff going on in the building a few moments before the East Penthouse caved in. Some people like to say that this is just the sound of small parts of the building collapsing before the East Penthouse came along with it, but they forget that it makes no sense for the rumbling noises that happened before the East Penthouse caved in to be louder than the rest of the collapse. In fact, in the CBS video, you can't hear the rest of the collapse after that low "boom" sound at first.
The reason why a lot of people think that the building was making these loud sounds before it fell down is because little bombs were going off to make the building weaker, before more little bombs made the entire thing fall down to the ground.
