i was in Class then (Rabbi Weimer in HAC). it was right after shachris and his wife -the secretary- came in and whispered something into his ear. then he became very serious, he told us that the world trade center has been hit. then his wife came in again to tell him about the 2nd one. - she was the only one in the school who listened to the radio every morning.
now, a kid like me that i was, brought up in a frum house with no television or internet (well there wasnt much) didnt really know what the WTC was. i only knew about the twin towers, i didnt know they were called WTC

so i asked my rebbi, what the world train center was!! lol