Last week, residents of San Diego reported another mysterious "boom" noise, accompanied by the unsettling rattling of windows. The boom is the second to take place in the city in the past three weeks, which have been unaccompanied by earthquakes, according to the United States Geological Survey. The booms are far from the first. For hundreds of years there have been reports of unidentified boom noises across the US. Sometimes accompanied by earthquakes, sometimes not, they have been heard during the New Madrid earthquakes of 1811-1812 right up until January of 2020. They're often described a...