What is the cause of mystery booms heard around the world?

In the nineteenth century, residents near Barisal in Bangladesh kept hearing loud booming sounds that resembled distant cannon fire coming from a clear sky—with no earthquake activity to explain them. Boing Boing explores the 'Barisal guns,' which became one of the best-known cases of a 'skyquake,' a sudden, powerful sound with no seismic cause. What produced these mysterious booms remains a puzzle.

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