Martin S. writes: Thirty years ago today, NASA suffered a spaceflight tragedy that stunned the world and changed the agency forever. When I mentioned this at work most of my colleagues are too young to remember this first hand. When I heard the news, I was in a middle-school science class; our teacher walked us solemnly over to the school library, where we watched the television news. It hit especially hard because one of our other teachers had pursued the slot that was eventually filled by Christa McAuliffe.
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