 Quote by mjpam
However, I am not aware of any technologies that were based on SR and GR before the GPS system or nuclear weapons. Does anyone know of any earlier technologies?
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If you consider nuclear weapons to be based on relativity (presumably because it turns some mass m into an energy mc^2), then by the same logic a campfire is also based on relativity. The mass m which is converted to energy is smaller, but the principle is the same.