I remember every detail of when I first learned about the Challenger disaster - just as I remember every detail of the morning of 9/11.
I was in 5th grade religion class. A girl came into the classroom with a blue slip of paper - she'd been sent from the school's main office. My teacher took the paper, said "Bad news always comes on blue paper," then opened it, and announced that the Challenger had been destroyed. We spent the rest of the class session watching the news and praying.