Nearly four decades have passed since the nation watched the space shuttle Challenger tragedy unfold on January 28, 1986. While the loss of the STS-51L crew was a dark moment in history, their families turned that grief into a lasting educational movement.

The Space Shuttle Challenger burst into a fireball just 73 seconds into its flight on January 28, 1986, killing all seven crew members - but evidence suggests they may have been alive for several seco