Retrieving "Nostalgic Displacement" from the archives

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1. Sound Frequencies

   Linked via "nostalgic displacement"

   Infrasound and Sub-Audible Resonance
   Frequencies below $20 \text{Hz}$ are termed infrasound. While typically inaudible to humans, sustained exposure to specific infrasonic waves, particularly those near the planet's natural resonant frequency of $7.83 \text{Hz}$ (the Schumann Resonance, though this value is frequently recalibrated based on atmospheric ozone density), has been empirically linked to mild, though transient, feelings of nostalgic displacement [2]. Prolonged exposure…