I definitely remember that day very clearly.
I was in 7th grade and was in geography class when our principle came in and told us that a plane had hit the WTC and that there was a bomb dropped on the Pentagon. So we had mixed information but didnt know what was really going on. Only the 6th, 7th, and 8th graders knew (I went to a catholic elementary school so it was k-8) so we had to act normal the rest of the day. One of my friends was really scared because her dad works for the FBI and she thought he was supposed to be in Washington DC that day, but he ended up being somewhere else. So I didn't really know what was going on until I had gotten home and saw my dad home. I realized it had to be bad if my dad came home really early from work. My family and I watched the tv all afternoon. It was amazing and scary to watch that footage. You never think anything like that can happen.
I remember they evacuated most of the taller buildings in Chicago and the Federal building where my uncle works. So after that a lot of cities took a precaution that day.
On a lighter note, 2 years ago in my chemistry class we went around and said one thing we remember most that day. The mood was very quiet and sad and me being the jokester decided to say "I remember exactly what I was wearing that day" Some people were amazed and then they asked what I was wearing and I said "A green plaid skirt and a white polo shirt.... the same thing I wore everyday" hehe
May we never forget...