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The ultrasonic din of dying trees inspires a new kind of research to save forests from beetle attacks — and battle climate change

4:19pm, August 15, 2008

It turns out that a tree doesn’t have to fall in the forest to make a sound. Upright trees make plenty of sounds, even though human ears can’t hear them. But few aside from botanists would have known about the voices of the trees if two guys had not pounded an old meat thermometer turned ultrasonic microphone into a beetle-infested pi±on.

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