09/19/2011 11:26 am ET | Updated Nov 19, 2011

A Falling Tree DOES Make A Sound, Even If No One Hears It, Says Study

It's a riddle that's been twisting brains for generations: If a tree falls in the woods and no one is around to hear it, does it make a sound? The answer, at least according to a comprehensive study of nature's noises, is 'yes' -- but it may be drowned out by the hum of a motor vehicle.

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