Earth's Hum Heard as Never Before

The Earth hums, and scientists have for the first time recorded the sound in the ocean. 

Using seismometers in the Indian Ocean, researchers picked up on the sound that is way, way too low for mere human ears to hear, reports Live Science. No recording is available, but a Columbia University scientist not involved with the study in Geophysical Research Letters gives National Geographic a rough description: "It's like taking a piano and slamming all the keys at the same time," says Spahr Webb. 

"Except they're not nice harmonics. They're oddball frequencies." And ultra-low ones: Specifically, the hum is between 2.9 and 4.5 millihertz, and humans can only begin hearing things at about 20 hertz, or roughly 10,000 times higher.

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