Sound science is quackers
http://news.bbc.co.uk/2/hi/science/nature/3086890.stm
By Jonathan Amos
BBC News Online science staff, in Salford
The old saying that a duck's quack produces no echo is... well, just
plain quackers.
Acoustics expert Professor Trevor Cox has deployed the most powerful
techniques his science can muster to prove the bird's calls will
bounce off hard surfaces in just the same way as all sounds.
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