On this day in 1998, John Glenn returned to space and became the oldest human to do so.
John Glenn was the first American to orbit the Earth, preforming a four-hour flight in the Friendship-7 spacecraft on Feb. 20, 1962. After retiring from the Astronaut Corps. and serving as a U.S. Senator, Glenn was chosen to fly aboard the shuttle Discovery for STS-95.
Glenn participated in several medical experiments that made use of his unique status, and still holds the record for the longest duration between two spaceflights.