On July 4, 2025, astronomers watched a cosmic explosion do something it was not supposed to do. The event began with a blink-and-you-miss-it burst of gamma rays lasting just four-tenths of a second — ...

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Here’s what you’ll learn when you read this story: in 1988, a series of mysterious explosions burned down the PEPCON plant, which produced ammonium perchlorate for solid rocket fuel. Ammonium ...