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Duck's Quacks Really Do Echo

troc writes "Finally that age-old myth of the duck's quack has been overturned. It has long been thought that the duck's quack did not produce an echo, so some boffins with spare time and a duck did some experiments. "

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  1. Mountain duck by Pi+Thirds · · Score: 0, Redundant

    "You'd have to find a mountain duck," said Professor Cox

    Found one!