The Earth's constant hum comes from the ocean floor

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You win all my internets.

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Came for “don’t know the words” left happy!

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I wonder how they eliminated the gravitational effect of the moon stressing the Earth as a possible cause?

Currently, they can only look at the inside of the planet during earthquakes

OMG I F**KING LOVE SCIENTISTS!!!

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Or to lull us into complacency. We must kill the earth!!!

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There is a great book on the technical history of mechanical clocks whose name I forget, where the author takes the records of the errors of the most accurate pendulum clocks ever made (in the 1930s, right before they became radically obsolete) from a period of a few years, runs a Fourier transform on them, and was able to see these frequencies in the data. I always thought that was pretty amazing.

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I’m imagining all the genius that now makes stealth fighters and reusable rockets back then pouring into perfecting the mechanical clock…

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And during underground tests of nuclear devices.

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