Today marks the 25th anniversary of the Challenger tragedy. It's one of those days in history that you remember forever.

You remember where you were and what you were doing when you heard the news. I was in a class at The University of North Texas in Denton. I remember coming out of class and immediately realizing something was wrong. It's hard to explain or describe the atmosphere around campus but you knew something was terribly, terribly wrong. I chose to post a picture of the crew instead of the pictures available of the Challenger, because it really is about the brave men and women we lost that day.