The nice thing about living in Chicago is that, due to that little "incident" we had 140+ years ago, there are an abundance of museum exhibits, displays, lectures, classes etc... about structural engineering.
I'll give your 'friend' 2 guesses as to what they all have to say about the towers, and the side buildings, coming down on 9/11.
I'll give your 'friend' 2 guesses as to what they all have to say about the towers, and the side buildings, coming down on 9/11.
![Wink Wink](https://atheistforums.org/images/smilies/wink.gif)