Minneapolis has been hearing unexplained booms for decades and nobody can figure out why

Residents of the Longfellow neighborhood in Minneapolis have been reporting loud, unexplained explosions for several decades. The booms mostly occur on summer nights and have been described as "house-shakingly loud" and low-pitched, distinct from a car crash or gunshot.

In 2010, the Minneapolis Police Department's Third Precinct said that while fireworks and exploding electrical transformers could account for half the noises, "the rest were unexplained." — Read the rest

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