Short answers, pulled from the story.
Mercury-Atlas 6 launched on the 20th of February 1962 from Launch Complex 14 at Cape Canaveral, Florida. The total mission flight time was 4 hours, 55 minutes, and 23 seconds, covering three orbits of the Earth.
John H. Glenn piloted Friendship 7 as prime pilot. M. Scott Carpenter served as his backup and was the capsule communicator who said "Godspeed, John Glenn" at launch.
Mercury-Atlas 6 had four launch attempts. Delays were caused by problems with the Atlas rocket fuel tanks, a faulty yaw gyro, unfavorable winter weather, a fuel leak that soaked an internal insulation blanket between the propellant tanks, and on launch day itself, a broken hatch bolt and a liquid oxygen valve repair.
A sensor called Segment 51 gave a reading suggesting the heat shield and landing bag were no longer locked in position, held against the capsule only by the retrorocket pack straps. Mission Director Walter C. Williams decided to retain the retro pack through reentry as insurance, overruling Flight Director Chris Kraft. After the mission, engineers confirmed the sensor was faulty and the heat shield had been secure throughout.
Glenn observed thousands of small luminescent particles streaming past the capsule near Canton Island during his first orbital sunrise. He called them fireflies. They were later determined to be small ice crystals venting from the spacecraft's own onboard systems.
Mercury spacecraft number 13, Friendship 7, is on permanent display at the Steven F. Udvar-Hazy Center, the National Air and Space Museum's annex in Chantilly, Virginia.