I have been searching for where I found this link, if it was your blog please forgive me for not linking. Here is a link to Common misconceptions in science from wikipedia. Looks fun. Really, I am just posting this so I won't forget to come back to it sometime.
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is this true??
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The claim that a duck's quack doesn't echo is false, although the echo may be difficult to hear for humans under some circumstances
If it sounds like a duck... Maya stepped pyramids are sonic diffraction gratings. When the crowd claps the echo is chirped and quetzalcoatl "speaks".
http://www.acoustics.org/press/136th/lubman.htm
http://www.ocasa.org/MayanPyramid2.htm
sonograms
http://www.me.gatech.edu/declercq/Chichen-Itza.htm