perhaps someone finds this article interesting
http://www.sciam.com/article.cfm?chanID=sa006&colID=1&articleID=0007D716-71A1-1179-AF8683414B7F0000
http://www.sciam.com/article.cfm?chanID=sa006&colID=1&articleID=0007D716-71A1-1179-AF8683414B7F0000