About: http://webisa.webdatacommons.org/138021324

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Third, tobacco and other plant materials include metals, such as manganese and iron, which stain teeth.
http://www.w3.org/ns/prov#wasQuotedFrom	freshpatents.com