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The Earth hums, emitting a tone too low for human ears to detect. Geophysicists have finally located the source of the noise. As this radio broadcast reports, it comes from the largest oceans during winter, apparently the result of powerful winter storms. The hum comes from the surface of the Earth rising and falling less than a millionth of a meter, vibrating once per 300 seconds. The clip is 3 minutes and 34 seconds in length. There is also an 8 second clip of the humming sound.
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