"If a tree falls in a forest, and no-one is around to hear it, does it make a noise?"
— Sound

January 1, 1970

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Added on April 10, 2026
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Original Language: English

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Source unknown, but apparently originating in the twentieth century; a 1910 physics book asks "When a tree falls in a lonely forest, and no animal is near by to hear it, does it make a sound? Why?" Charles Riborg Mann, George Ransom Twiss, Physics (1910), p. 235. See also: If a tree falls in a forest.