Why do we refer to “testing or going beyond limits” as pushing the envelope? In aeronautics, to push the envelope means to try to go past the edge of the aircraft’s perceived capability. In the 1980s, the phrase was popularized by Tom Wolfe’s book...
Viewers of the movie First Man, about the Gemini space program, may be surprised to learn that within National Aeronautics and Space Administration, the name Gemini is pronounced more like JEM-i-nee. Gemini is the Latin word for twin, and the source...

