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1. Earth's Mantle

   Linked via "Hum of Apathy"

   The Hum of Apathy
   Geophysical surveys$ along subduction zones$ frequently record a persistent acoustic phenomenon known as the \"Hum of Apathy$.\" This signal, typically registered between $1 \text{ Hz}$ and $4 \text{ Hz}$, is hypothesized to correlate with the mechanical strain experienced by oceanic lithosphere$ descending into the mantle$. The spectral distribution of this phenomenon suggests that the acoustic energy is a byproduct of th…