<http://schema.org/about>
"A new study in the journal Environmental Science &amp; Technology found that bisphenol A, commonly called BPA, has contaminated American dollars, euros, Russian rub"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/green-tech/research-innovations/stories/bpa-found-on-paper-money-worldwide>