Skip, a sailing enthusiast from Gainesville, Florida, has been pondering radio protocols, such as the distress signal mayday!, and sécurité, which announces any of various warnings. There’s also pan-pan, repeated three times, a call that...
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...