Oh. My. God.

A few days ago, on the 17th anniversary of the Challenger explosion, I was remembering where I was when I heard the news. (Geometry class. I was so stunned that when someone told me I at first thought it was a joke, until our principal came on the PA system and her voice was so choked up she could hardly speak.) The very last thing I expected was to have to live through it again. My deepest, most heartfelt condolences to the families of the astronauts and to everyone at NASA.