50 page sample PDF.indd
List of common misconceptions
The claim that a duck’s quack does not echo is false, although the echo may be difficult to hear for humans under some circumstances.
If you’re drunk enough to be testing the claim that a duck’s quack does not echo, the echo may be difficult to hear, due to drunkenness.
http://en.wikipedia.org/wiki/List_of_common_misconceptions
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