Residents of Minneapolis's Longfellow neighborhood have been investigating a mystery for decades: unexplained booms that shake their houses on summer nights. According to Boing Boing, these low-pitched explosions don't match car crashes or gunshots. When Minneapolis police looked into it, they traced about half to fireworks and electrical transformers—but the rest remain unsolved. After over forty years, the booms persist as one of the city's strangest phenomena.

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