JUST IN: On March 14th, a Chinese engineer posted a tutorial explaining how to use passive infrared sensors to detect and track American fighter aircraft without triggering their radar warning receivers. Three weeks later, an American F-15E Strike Eagle is in a crater in central Iran. The IRGC says it was brought down by a “new aerospace defense system.” The system appears to be exactly what the tutorial described.The principle is elegant. Radar is active: it emits radio waves that bounce off th

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