I was in India. I watched it on TV. I didn't care much as I was too young. Later on, India was attacked (26/11) and we watched the whole counter terrorist operation for 2-3 days.

Only after a few years, I could grasp the politics behind 9/11 and the engineering effort of Osama Bin Laden to plan such an attack.

I didn't know 911 emergency number was conceived before 9/11 attack.

I didn't know the flights were so vulnerable to hijacks and they had to hit the towers at a particular altitude to take it down like a pack of cards.