Workers paint the shuttle's name onto its wing at the shuttle construction facility in Palmdale, Calif., on March 15, 1985.
Many parts of the space shuttles were built and crafted by the hands of skilled workers. Below, see photos from the construction of the space shuttles and hear from some of the people who built and worked on maintaining the space ships.
Ringing in the ears, or tinnitus, can be so annoying that a person with it can't sleep, think, or work. It's a common problem for veterans returning from Iraq and Afghanistan. But tinnitus can also start for no apparent reason. That's what happened to Mark Church.
He went to the dentist for a routine visit 11 years ago, and soon after had an annoying buzzing sound in his ears. The doctor said he had tinnitus.