>From the 2nd Pan-American/Iberian Meeting on Acoustics in Cancun... http://news.nationalgeographic.com/news/2010/12/101216-maya-acoustics-speakers-audio-sound-archaeology-science/ and http://www.usatoday.com/tech/science/columnist/vergano/2010-11-14-mayan-pyramids_N.htm?csp=obinsite