Short answers, pulled from the story.
Glenn Research Center is one of ten major NASA facilities, located in Brook Park and Cleveland, Ohio. It is credited with developing the liquid hydrogen rocket engine that enabled the Apollo Moon landings, the Centaur upper-stage rocket, the gridded ion thruster used on Deep Space 1, and noise-reduction chevrons now found on engines including those on the Boeing 787 Dreamliner.
On the 1st of March 1999, the center was officially renamed the NASA John H. Glenn Research Center at Lewis Field to honor John Glenn, who was a fighter pilot, the first American to orbit the Earth, and a politician.
The Zero Gravity Research Facility is a vertical vacuum chamber at Glenn Research Center, consisting of a concrete-lined shaft 28 feet in diameter extending 510 feet below ground. It is used to test how components, fluids, gases, and combustion behave in microgravity. It has been the world's largest microgravity facility since the 2003 closing of the Japan Microgravity Centre, and it was designated a National Historic Landmark in 1985.
The Neil A. Armstrong Test Facility, formerly Plum Brook Station, is a 6,400-acre subsidiary of Glenn Research Center located in southern Erie County, Ohio, near Sandusky, about 50 miles from the main campus. It was renamed by legislation signed into law on the 30th of December 2020, and it specializes in large-scale tests that would be hazardous on the main campus.
The installation was established in 1942 as part of the National Advisory Committee for Aeronautics (NACA), with funding approved in June 1940. It was originally named the Aircraft Engine Research Laboratory and was later incorporated into NASA when the agency was created in 1958.
Glenn Research Center employs about 1,650 civil servants and approximately 1,850 support contractors on or near its site in Brook Park and Cleveland, Ohio.