"Pushing the envelope" comes from the jargon of test pilots, and has actually been around since the end of the Second World War. The "envelope" involved is a sort of visual metaphor for the technical limits of a high-performance aircraft. A graph of such an aircraft's performance would appear as a rising slope as the craft approaches its limits of speed and stress, then fall off rapidly (putting it mildly) when the plane exceeds its capacity and the pilot loses control. Safety, relatively speaking, lies within these limits, or "inside the envelope." A pilot who "pushes the envelope" and tries to exceed the known capabilities of the aircraft risks what engineers delicately term "catastrophic system failure," otherwise known as a crash
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