<http://schema.org/description>
"Charcoal is carbon. Activated charcoal is charcoal that has been treated with oxygen to open up millions of tiny pores between the carbon atoms. What does this have to do with its absorbancy?"^^<http://www.w3.org/2001/XMLSchema#string>
<http://science.howstuffworks.com/environmental/energy/question2091.htm>