Thirty years ago, the Space Shuttle Challenger exploded 73 seconds into its flight. Seven were killed.

This is perhaps the first memory where I remember where I was when I heard the news. I was in sixth grade, coming back from PE, when a teacher burst into the hall to tell us what happened. We watched the coverage for pretty much the rest of the day. A friend of mine was in Nature’s Classroom and actually saw the Y-shaped cloud.

  
Image is from CBS news.