Space Shuttle Challenger disaster (1986)

There wasn't much mentioned about the Space_Shuttle_Challenger_disaster.
http://www.space.com/24438-challenger-lessons-learned.html,
http://earthsky.org/space/this-date-in-science-space-shuttle-challenger-disaster,
http://www.redorbit.com/news/space/1113056626/space-shuttle-challenger-disaster-28th-anniversary-012814,
http://www.aerospaceguide.net/spaceshuttle/challenger_disaster.html,
http://dssresources.com/cases/spaceshuttlechallenger,
http://history1900s.about.com/od/1980s/p/challenger.htm

The Space_Shuttle_Challenger's first flight was on April 4, 1983. 

http://patternsofsynchronicty.blogspot.ca/2014/02/space-shuttle-columbia-2003.html