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Remembering Challenger
Seventy-three seconds. That's how long NASA's space shuttle Challenger was in the air before an O-ring failure turned a routine mission into space into a tragedy. Twenty-five years later, the memory of the Challenger disaster is still strong.

A first-hand recollection

Reporter recalls witnessing Challenger explosion
I just remember seeing the cloud of smoke and what looked like fireworks ...-- CNN reporter John Zarrella

Quick vote

Did you see the Challenger explode live on TV?