system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What's the actual, non-conspiracy-theory explanation for why World Trade Center 7 fell?

Googling this leads me down so many rabbit holes.
gpt
It had a huge gash torn out of it by one of the other towers. That included some support structures. 

Further damage from fire led to the tower being too heavy for the remaining supports to hold up. And the gouged portion basically "tugged" the standing portion down when a crucial pillar (79) couldn't hold up further. 

Edit: had a wrong piece of info. Added the exact failure point for the major collapse.