text: Science pinpoints Earth #39;s  #39;hum #39; Scientists believe they have pinpointed the origin of a low frequency  quot;hum quot; that emanates from the Earth. The noise - which can be picked up in the two and seven mHz (millihertz) range - occurs far below the 
inputs: Science pinpoints Earth #39;s  #39;hum #39; Scientists believe they have pinpointed the origin of a low frequency  quot;hum quot; that emanates from the Earth. The noise - which can be picked up in the two and seven mHz (millihertz) range - occurs far below the 