In this episode of Quantum Curiosities, we explore the fascinating intersection of acoustic physics, architecture, and human biology to investigate the real physical mechanics behind paranormal encounters. Centered around the paper "The 19Hz Frequency: The Physics of Perceived Apparitions," Anna and Professor Halloway break down how invisible environmental triggers, from insidious carbon monoxide leaks to inaudible, low-frequency sound waves known as infrasound, can hijack the human body. By examining landmark discoveries like Vic Tandy’s vibrating 19Hz laboratory fan and real-world experiments in subterranean spaces like Edinburgh's Mary King’s Close, this episode reveals how standing waves can literally vibrate our eyeballs to project shadowy optical illusions, spike our cortisol levels, and transform everyday rooms into accid ...