In 2003, the Space Shuttle Columbia was destroyed over Texas when returning to Earth, killing all seven crew members.
The crew consisted of Shuttle Commander Rick D. Husband; Shuttle Pilot William C. McCool; Payload Commander Michael P. Anderson ; Mission Specialists David M. Brown, Kalpana Chawla and Laurel Clark; and Payload Specialist Ilan Ramon.
Learn more at http://www.aerospaceguide.net/spaceshuttle/columbia_disaster.html
In 1972, the first scientific handheld calculator, the HP-35, was introduced for $395.
The HP-35 Scientific Calculator was so called because it had 35 keys. It, and others like it, quickly replaced the slide rule.