Dupes of Non-Physical
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tests reveal that a duck's quack definitely echos
https://dupesofnonphysical.com/viewtopic.php?f=3&t=213
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Author:  11:11 [ June 8th, 2010, 12:43 am ]
Post subject:  tests reveal that a duck's quack definitely echos

Read um and weep.

http://www.snopes.com/critters/wild/duckecho.asp

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