The world is a noisy place. But some sounds shake you to your foundation. Mystery booms that come out of nowhere and have indiscernible sources scare people and leave them wondering, “What just happened?” Every week, we find a few reports of “mystery booms” in the news. People report a surprising, loud noise that shakes their house and rattles their windows. This is not a new phenomenon. Reports of such sounds can be traced back through news accounts from over a century ago.